I've seen them too, Sonya, but not the big jugs. Gallon jugs, yes; 5 gallons, no.
Flobish, I don't know what your tap water is like, so it's hard to make a judgement call for you. I live up near Doylestown in Bucks County, and I have a well. My water is great (other than a pH of 4.7 that I have to neutralize), but after 25 years of using tap water wherever I lived (GA, KY, SC, NJ, and here), I started using RO about 15 years ago, and I'll never go back. The plants look "cleaner" and shinier, and grow better and healthier.
One cannot simply change to a pure water source alone, however. Most tap water, containing dissolved minerals, can buffer the pH - that is, adding other chemicals does not radically affect it. Pure water does not have such buffering capacity, so if you use common fertilizers (like your Miracle-Gro, for example), the pH will plummet to dangerously-low levels. Instead, you either have to adjust the pH after mixing, or switch to a formula made specifically for pure water supplies, like the Greencare Orchid Special for RO (the original, so-called "MSU Fertilizer").
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