Use only safe water for drinking and preparing food. 

• Boil it: If people are concerned about the quality of water they use for drinking and cooking, it is recommended to treat the water first by boiling it (place water in a clean container and bring to a boil and keeping boiling for at least 1 minute) or
• Treat it: Treating water with household bleach (add 1 teaspoon of household bleach (containing 3 to 5% chlorine concentration) to 20 litres of water, mix well and leave it to stand for at least 30 minutes before use). Do NOT add any more bleach than mentioned here (1 teaspoon per 20 litres). 
• Store it: Water should be stored covered in clean containers. Make sure the container you use to collect water from water tankers is properly cleaned before adding safe water to it.