Ph water do tou have preference

Im going to be starting my hydro system up by the weekend , i basicay have everything i need have a pump to keep qater moving, an airstone for oxygenation for the roots and pre ph balanced nutes my questions do people have preference for the type of water they buy from. The store for use in their hydro systems

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I mostly use rain water and tap that has been left out a while if it hasn’t rained enough to fill my reservoir.

But i run a sterile system with 3-5ml of h2o2 in my reservoir per gallon so nothing is living in my solution good or bad. It also helps with super charging the water with oxygen…

My methods are not common but it works and i can about use any source of water really…

But buying water by the gallon can get expensive fast…