You can use distilled water or filtered water, even regular water – if you use filtered or regular water, just boil it first to prolong the final product’s shelf life.
TIPS & TRICKS
If you want to make a specific quantity of magnesium oil for one specific bottle, fill that bottle 3/4 of the way with water, pour it into a measuring cup to measure it, then heat/boil it and use the same amount of magnesium flakes!