If ur solution is way low in ph, and you cant adjust it, dump it, and make a fresh batch of nutes... even if it means being weak/watery for a half a day in order to keep the Ph up, and get additive as soon as possible... I got 1 party store nearby open til 2am, and 2 24hr stores (one a walmart of course)
convenience stores sell baking soda.... fuck man, knock on your neighbors door and sheepishly say "I know this sounds cliche` as all hell, but I am half way thru making my friends birthday cake and I dropped my baking soda in the sink! Can you by any chance spare me like a couple tablespoons?"
Aint you got just one coke-friendly buddy who you just KNOW has some baking soda?
I feel like ur not really applying yourself to the full spectrum of options for acquiring baking soda...