If you use RO water, you still need to use some of your well water to keep some minerals in there so that there is a charge and the nutrients will mix.
I would not want the chore of bottled water unless the system is tiny. That is just me, I'm too busy.
I would send your well water to a lab and figure out exactly what the mineral load is, and then you can, with help, figure out how to adjust your nutrient mix.
The meter you have coming will tell you total dissolved solids, but will not tell you what specific the elements are.
If your source water is under 100 ppm, you could skip the test if you want to save money.
Approaching 500 ppm, it is a must.
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