sodium borate, USP, available at your local pharmacy just ask...

5g/L or close to 1oz/gal is safe up to 2floz/day but as i experienced, i put on a bit of weight, which actually was remarkable because i've not had anything cause me to put on weight except shit-tons of sugar, no amount of potatoes or rice or any such carbs can make me fat like adding a bit too much boron

it's present in all vegetables and fuck the FDA, they say that water should have less iron than Evian water from the french alps does

which lets them put potassium permanganate in your water

guess what disease you get from excess manganese ingestion?

it's a lot like AD/HD and a lot like parkinsons in extreme, it's called manganism, look it up