seltzer water

is it ok to enjoy seltzer water...raspberry/Lime..on back of can says it contains Zero of everything sugar,calories,etc.?

also some herbal teas on back of box say contains Potassium 10mg? should you stay away from these.

finally Lipton has a lemon light ice tea out also say's on back under nutritional facts contains Zero in all catagories

these three are my favorite drinks as treats and helps break up the long cleanse and keep me going. Curious what long time MC'ers view is on this. Thanks!

Thanks!
SMH