NUUN tablets (12 Tablets) dissolve in water, similar to Alka Seltzer, but NUUN tastes much better, and once the tablet has dissolved the bubbles disappear. The ratio is one tablet for 16 ounces of water, which just so happens to be the size of many cycling water bottles. The tablets come in five flavors: lemon-lime, tri-berry, orange ginger, kona cola, and citrus fruit, and all are made with no artificial colors.