I use Kroger’s drinking gallon jug water, ph out of jug is like 5.7 , I can ph up it to high 6 or just 7 I guess ??? Is
Is this ok to do the last couple weeks to get rid of nutes ,so plant use all up before harvest.
So doesn’t mess taste up.
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Perfectly fine. 
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What’s your tap water TDS/PH. I feed water only the last 2 weeks leading up to harvest versus a flush 
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If it is Distilled or RO (Reverse Osmosis) then the ppms are negligible and the pH is pretty neutral and will drift according to medium.
Thing is, if you are flushing before harvest, pH doesnt really matter. U want to eliminate nutrients but sending pH out of range would accomplish the same goal. Make nutrients less available so she uses what she has stored up.
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