For a three-day interruption in a Thai apartment, set aside at least 9 litres of clean drinking water and nine eating occasions per adult, using shelf-stable foods that are edible without electricity or refrigeration. For two people that becomes 18 litres and 18 eating occasions; for four, 36 litres and 36. This is a home reserve, not a request to carry 36 kilograms of water downstairs if the building is evacuated. The Thai Food and Drug Administration (FDA) recommended at least 3 litres of clean drinking water per person per day for at least three days in its 25 August 2026 emergency-bag guidance. Babies, illness, heat exposure and pets need separate planning rather than automatically sharing an adult allowance.
In a Bangkok condominium, the first question is whether you can safely remain in the building. Floodwater reaching electrical equipment, unsafe access routes, a building closure or an official evacuation order means leave when instructed, even if your cupboards are full. A grab-and-go bag and a three-day pantry solve different problems.
Your three-day shopping result: count sealed water and actual meals
| Household | FDA-based clean drinking water | Practical 1.5 L bottles | Breakfasts + other meals over 3 days |
|---|---|---|---|
| One adult | 9 L | 6 bottles (one 6-pack) | 3 breakfasts + 6 main meals |
| Two adults | 18 L | 12 bottles (two 6-packs) | 6 breakfasts + 12 main meals |
| Four people* | 36 L | 24 bottles (four 6-packs) | 12 breakfasts + 24 main meals |
Four adults or an illustrative four-person starting count; adjust for children, baby feeding, medical restrictions and anyone who needs additional water. A common Lotus's example is six 1.5 L bottles, or 9 L per pack. One, two and four packs respectively give 9, 18 and 36 litres. No fixed price is assumed: online prices, promotions, stock and delivery depend on the date and location. Water is heavy: 36 litres weighs about 36 kg before packaging. Place family supplies on stable, accessible shelves; do not block exits or load one weak shelf.
Meal numbers are a shopping-plan calculation, not a legal nutrition prescription. An adult eating breakfast, lunch and dinner three times daily needs nine eating occasions; foods must be appropriate for their actual diet and sufficient energy. This simple framework is better than buying nine packets of instant noodles that all require boiling water.
Put together a usable no-cook basket
For one adult over three days, a practical starting basket is: three servings of cereal, crackers or bread products that do not need refrigeration; three small shelf-stable UHT milk or tolerated alternatives; six ready-to-eat main portions such as pull-tab canned fish, beans, cooked canned meals or clearly labelled ready-to-eat pouches; three fruit portions or safe canned fruit; and modest familiar snacks. Add a manual can opener if any can lacks a pull-tab, spoons, a cup, basic hygiene supplies and a small bag for rubbish. This is an illustrative menu, not a guarantee that one can or one snack equals an adequate meal; read net weights and dietary needs.
For a couple, buy twice the edible portions and favour single-use small packages rather than a large opened can you cannot refrigerate. For four people, plan 12 breakfasts and 24 main portions, distribute foods by age and allergy, and label a separate bag of medically necessary items. If you normally eat halal, vegetarian, low-salt or allergy-restricted food, choose packets you can identify before the emergency.
A shelf-stable product is usually safe at room temperature only until it is opened and within the manufacturer's specified conditions. UHT milk and retort packs often need refrigeration after opening. Keep unopened goods dry and away from direct heat, leakage, insects and anticipated flood levels. Throw away flood-contacted food; smelling or tasting it is not a reliable food-safety test.
Where to buy in Thailand, and what to check at the shelf
Use the ordinary grocer you can realistically visit before the storm: Lotus's, Big C, Tops, a supermarket near your condo, or a convenience store for small missing items. Their names are shopping options, not a verified claim that every branch has every item today. Find sealed bottled drinking water, canned proteins or beans, fruit cups, crackers, and small UHT cartons. If you order online, treat the arrival date as uncertain—delivery may stop when roads flood.
In the aisle, check four things: (1) food really is ready to eat or only "ready after heating"; (2) best-before dates allow a reasonable rotation; (3) packages are intact, not swollen, leaking, rusting or damaged; (4) nothing depends on a fridge, electric dispenser, kettle, microwave or gas supply you might lose.
Example budget without false prices: One 9 L water pack plus 3 breakfasts and 6 main portions is an actionable list even when local shelf prices cannot be confirmed. Make your own total from labels in one shop before checkout; do not compare a promotional single water price with a full food-basket budget. If you already buy beans, tuna and UHT milk weekly, buy an extra set and consume the oldest first instead of paying for an expensive emergency-branded box.
A pantry and an evacuation bag are different
| Keep at home while the building is safe | Carry in a portable departure bag |
|---|---|
| Full 9/18/36 L sealed water target, food for three days, clean containers, waste bags | Water you can safely carry for the journey, compact no-cook snacks or meal portions |
| Spare lighting/batteries, hygiene, pet needs and medicines according to your household | Passport/ID copies, phone, charged power bank, medication, glasses, some cash and child essentials |
| Dated rotation list and safe shelving above foreseeable leaks | A light, accessible bag near your exit; know stairs and official meeting point |
Thai FDA includes energy-dense biscuits, crackers, canned products and UHT milk among suitable emergency-bag food examples. That does not mean it is safe to remain in a flooded home, nor does it make a large supply portable. The Thai government's flood-response reporting gives the operational backdrop; follow current local warnings, building management and emergency instructions, not an older news article's historical situation.
What happens when power and water stop together?
Failure case: A family stored only frozen meals, dry noodles and a large jug attached to an electric dispenser. The lift stops, the fridge warms and the kettle fails. Their emergency food now requires electricity, hot water or a functioning lift. A basket of edible-at-room-temperature single portions and separately accessible sealed bottles would cover the safe waiting period; if water reaches dangerous systems or management orders evacuation, leave with the light bag, not the 36 L home supply.
Avoid lighting an outdoor stove, barbecue, charcoal cooker or generator inside a condo or enclosed balcony; carbon monoxide is dangerous. If safe cooking equipment cannot be used according to its manufacturer and building restrictions, plan to eat the no-cook portions. The first day should not require any heating.
Use the oldest eligible packs in ordinary meals and replace what you used, preferably with a dated shelf label and a quarterly look at storage conditions. Swap out damaged packaging immediately. Keep baby formula preparation, prescription storage, disability needs and pet food/water as separate named requirements.
The 15-minute preparation that matters today
Count your real household, multiply 3 L × people × 3 days, round up to available sealed bottle sizes, and build a menu with enough true meals—not only snacks. Store it before heavy rain, keep an easy-to-lift exit bag, and identify the latest building and local-government alert channels. If the situation becomes unsafe, evacuating safely takes priority over protecting your stock.
This is practical readiness, not a claim of a current flood emergency or a fixed price guarantee.