Demand - How many people are you providing for?
Source - Where will you get the water?
Collection - How will you collect it?
Decontamination - How will you make it safe to drink?
Obviously, some common sense needs to be applied here:
- Don’t contaminate water. Build latrines at least 100 feet from your water source.
- Stagnant water must always be purified.
- Keep water resources separate - douse water, cleaning water, and drinking water should all be separated.
- Use only what you need - keep stocks proportional: drinking water is always the priority.