Water quantity
You should have at least four litres of water per person per day - for drinking, food preparation, personal hygiene and dishwashing. So for example, if you have three family members, you should have 12 litres a day for at least a three-day period, i.e. 36 litres of bottled water in a cool, dark place, in washed and disinfected plastic bottles that are easy to carry.
Record the date that you bottled or stored the water on the label. Replace stored water every six months and store-bought bottled water every year.
If you have pets or a service animal, don't forget to store approximately 30 millilitres of water per kilogram of the animal's weight per day. For example an average cat or small dog would require at least 1/5 of a litre (or half a cup) of water per day.
Water storage
If your local water is treated commercially by a water treatment utility, you do not have to treat the water before storing it. If your water comes from a public well or other public, non-treated system, follow instructions about water storage provided by your public health agency or water provider. Likewise, if your local water comes from a private well or other private source, consult with your local public health agency about recommendations regarding storage of water. Only your local public health agency should make recommendations about whether your local water can be safely stored, for how long, and how to treat it. In all cases, it is important to change and replace stored water at least every six months.
Water treatment
You should treat all water of uncertain purity before using it for drinking, food preparation or hygiene. Treatment can vary depending on the nature of the contamination, but when in doubt, do not drink water you suspect may be contaminated. There are many ways to treat water and none are perfect. Often the best solution is a combination of methods. Boiling and disinfection will kill most microbes but only distillation will remove other contaminants such as heavy metals, salts and most other chemicals. Before treating, let any suspended particles settle to the bottom, or strain them through layers of paper towel or clean cloth.
- Boiling Water: Boiling is the safest method of treating water. Bring water to a rolling boil for 10 minutes, keeping in mind that some water will evaporate. Let the water cool before drinking.
- Disinfection: You can use household liquid bleach to kill micro-organisms. Use only regular household liquid bleach that contains 5.25 percent sodium hypochlorite as the active ingredient. Do not use scented bleaches, colour-safe bleaches or bleaches with added cleaners. Add one to two drops of bleach per litre of clear water. If the water is cloudy, treat with three to four drops of bleach per litre. Stir and let stand for 30 minutes. If the water does not have a slight bleach odour, repeat the dosage and let stand another 15 minutes.
- Distillation: Distillation involves boiling water and then collecting the vapour that condenses back to water. The condensed vapour will not include salt and other impurities. To distil, fill a pot halfway with water. Tie a cup to the handle on the pot's lid so that the cup will hang right-side-up when the lid is upside-down. Make sure the cup is not hanging into the water and boil the water for 20 minutes. The water that drips from the lid into the cup is distilled.