Bananas
Bananas, as well as cantaloupe, honeydew, grapefruit juice, and prune juice all have high concentrations of potassium in them. Healthy alternatives include apples, berries, grapes, peaches and pineapples.
Brown Rice
Brown rice is a whole grain, and whole grains have a higher potassium and phosphorus content. For a substitution, try grits, white or wild rice, bulgar, buckwheat, pearled barley, couscous, and white or whole wheat pasta or macaroni.