Question:
I was using the TWP by Aquarium pharm. I did a pretty thorough search on the net, and the results were pretty ok. The consensus was except for certain applications, it was very expensive.

I can buy RO water at the grocery store but I think I will tire of lifting the bottles and carrying them. I rolled this one in. I wonder how safe that is? (Given my weight i think i weigh half the bottle weight.)

I am trying to find out how economical buying the water for home use would be. (Having deliveries). I have asked around and it's not terrible (lot cheaper to carry your own though).

Anybody having water delivered?

Answer: I live in an apartment and did all the calculations and it works out cheaper for me to buy water and have it delivered. I am paying 0.12/litre delivered for RO/DI and UV sterilized water. On top of that, once a month with my delivery they bring a copy of the water tests (government testing by an independant lab) of their water and also one of tap water for comparison. I am quite happy going this route.

I think for a two gallon (5%) water change a week and one gallon in evaporation water a week, I need about 12-15 gal a month. I think one company does the three five gallons when you need it thing. So I don't think it would cost me as much. I probably have a smaller tank?