When I first started my 100 gallon; I was using tap water exclusively. I had concerns with some algae blooms. I then started using RO water from one of the grocery stores; but lugging around the plastic bottles became extremely cumbersome. That is why I bought the RO/DI system eventually.
I did like the way my salt mixed with the RO/DI over the tap water. I used Reefers Best salt and it just seemed that there wasn't any residue with RO/DI and there was with tap water.
My thought is to go somewhere in between full RO/DI and tap water so that I can make water faster, with a pretty decent amount of filtration, and zero waste.
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New 280 gallon inwall in planning stages;details, details, details. 
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