Down the rabbit hole for fertilizers

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I think using the MSU well water blend with pure water produces low pH solutions, but that may not be a problem for the orchids, because most media will raise the low pH. Using the pure water blend with tap water will probably not cause problems.

I buy 20 pound / 9kg bags of 20-20-20 plus micronutrients at a nearby agricultural supply store for a much lower price per pound than any house plant or hobbyist orchid fertilizer. I use the 20-20-20 on all my plants not in the ground, including the orchids, so I go through a few bags a year.