Do you put acid into water or do u put water into acid ? does it matter ? WHY?

Always put acid into water. Never the other way around. This is to avoid accidental burning.

Acid Into Water

You should pour the acid into the water. That is standard lab practice. This prevents splashing of the acid when the water hits it. Also, any impurities in the water that may react will have a smaller volume of acid to react with when you first pour the acid in. If you pour slowly and the reaction is severe, you can stop pouring before it's all in there.

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The problem with rainwater is the asphalt tiles leech chemicals into the water. The organic matter from the birds and the leaves aren't as big of a problem. Reverse Osmosis would be the wrong way to go, for every gallon of RO water, you waste 20 gallons of water. If you want water that pure which is ridiculously pure especially if you're starting with rain water then you would want to use deionization bed filters. Deionization filters need to be recharged periodically with acid but you can treat them like disposable filters too. Usually a sand filter and chlorination would be all that's needed for potable rain water if you have ceramic tile roof shingles or a metal roof. Note that the problem is that all forms of filtering will harbour bacteria hence the chlorination. The UV lights will also kill the bacteria but it's likely that the health authorities will require something like chlorination. The best way would be to set up a natural swimming pool type of ecosystem to filter the water. In a natural swimming pool where you use a balanced ecosystem to keep the water pure, it's often better quality of water than municipal supplies. It does take up a lot of space though so you would need a rather large yard to do it. In a natural swimming pool, the bacteria become a critical component in the ecosystem and helps break down organic compounds for the plants to remove from the water. Note that the ancient romans and the ancient chinese would collect rain water in open cisterns in their courtyards. They kept water plants to keep the water pure and fish both to have fresh fish and to know if the water got contaminated, so long as the fish were alive, the water was safe to drink. Of course boiling the water was still prudent. With grey water, my personal preference is to collect water from the shower and bathroom sinks but not from the kitchen sink. Too much food material gets into the kitchen sink water. A sand filter is pretty much all that's needed to treat the grey water. The tough part of grey water is all the plumbing, it's easiest if it was built into the house when the house was built rather than retrofitted. Modern good quality low volume flush toilets like Toto are very thrifty with the water so grey water may not be worth the expense. Usually the sand filter is done by layering some gravel and sand into the cistern itself. Helps support the cistern and the cistern becomes a filter. A charcoal filter will improve the taste of the water which would be important if the roof was metal. If I was you, I would just put gravel and sand into the cistern, use the UV lights and have the water tested to see if it met health standards. Then perhaps a charcoal filter and a sediment filter under the counter. For consistent water pressure, nothing beats a water tank in the attic or on the roof. A water tower if you want high pressure for decent showers. You can use a windmill to pump the water from the cistern up to the water tank.

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RE:

Do you put acid into water or do u put water into acid ? does it matter ? WHY?

when acid and water combine heat is released, but you never pour water into acid because it can cause the acid to splash, which is bad, ummmmkay.

(the heat caused will be built up at the point of entry into the acid, as opposed to dispersed in water)

When working with very dilute acids, like household vinegar, it doesn't really make a difference, though (shhhh. Don't tell them I told you.) :)

Acid into water. If, for instance, you've added 5% and it spills or spatters, if you've added acid to water, you have a 5% acid solution, which will not be that difficult to deal with. If you've added water to acid, you have a solution that is 95% strong acid, which can cause some serious problems.

Always pour acid into water. If water were to be poured into acid, the reaction will be an explosion with dire results.

i am only familar with the use of one powerfull acid and that is muriatic acid used in swimming pools. i know that if you pour the acid into water it is fine . if you pour the water into the acid it makes a yellowish foam and a gas that is deadly .

that would seem to be a good reason to pour acid into water and not the other way round

You don't want to splash the acid out (and possibly injure yourself). So, you always pour the water in first and the acid in second. This prevents the acid from jumping out at you.