Water

I would say if the water is just going to be used mixing and not for topoff water, then yes. My preference is to keep the two separate.
 
Yes. The small amount of salt residue that may contaminate your RO/DI water slightly is insignificant as long as you are using it for the tank (new salt water mix or top off) and not for consumption or cooking.
 
I'm with Ron on this one. I've used a single 55g barrel for over 25 years without issue, but I use all of it every water change
 
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