We recommend using this quart bottle to make the Zeta Aid Concentrate. Mix one full package of Zeta Aid Crystals into the Quart bottle. This pre-printed Quart bottle is for mixing the Zeta Aid crystals with "good" water, distilled or reverse osmosis (R/O) water, thus creating the Zeta Aid "Concentrate". Consume the Concentrate 1 Tablespoon at a time in a glass of "good" water. Using the Quart bottle helps to distinguish Zeta from other clear liquids in the refrigerator. Quart bottle is dishwasher safe, pours easily and contains no BPA's.