WATER, WATER, WATER and ELECTROLYTES. i drink 3 qts of water a day even when I’m not fasting. I also take magnesium, calcium, potassium and sea salt (among other vits. and supplements) when fasting. Take the supplements with lots of water. If they make you nauseous taking them all at once, take one at a time, space them out through the day. Dizziness can also be from dehydration, so drinking as much water as possible is vital, because you’re going to pee most of it out.