What if I'm taking a capsule with food? Is that a bad idea? I've been doing that for the past few weeks and I'm still alive. I'm joking of course. If it's dangerous I'll stop ASAP. NOW Foods has pretty good prices on the ones you mentioned (gluconate and chloride. Purebulk.com sells potassium citrate along with a few other types of potassium. Potassium bicarbonate is sold at nuts.com but they charge a lot for shipping unless your'e planning on buying a lot of stuff so maybe there's better sources for that type.