I take ZMA and potassium daily. I will drink electrolyte water too. When I get home from the gym and feel drained I will drink 8oz of chicken broth for the salt. I had some severe cramps before starting this.
I don't know what the daily values are to be honest. I just take it until my symptoms, mostly cramping, go away and stick with that dosage. I basically eat broccoli or brussels sprouts with dinner every day. They both seem to have a decent amount of potassium.
I buy potassium bicarbonate from Amazon in bulk -- ten bucks a pound. Winemakers use it to reduce acidity in their product, but it's easy enough to mix half a tsp in water twice a day. Lot of research on bicarb, too, so useful outside of keto issues.