It's extremely hard to be phosphorus or potassium deficient ... the stuff is everywhere.

Potassium: potatoes and Morton's "Lite Salt"
Phosphorus: dunno, I've never heard of anyone except a kidney dialysis patient having problems with it. Bones and red meat, probably.

If you eat a varied diet, heavy on the fresh (or frozen) fruit and veggies light on the junk food and sweets, it's hard to be deficient in anything.

Potassium is found in bananas,chicken. A lot of multis are a waste of money because they don't have enough of anything in them. Nor are they balanced.