Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to make water gel [title] Get some sodium polyacrylate. [step] Sodium polyacrylate is an absorbent polymer that can absorb up to 400 times its weight. It is found in many absorbent products, such as diapers, and you can buy it online.

Ending1: Sodium polyacrylate is readily available at grocery stores and online. [substeps] Sodium polyacrylate helps replace fats in the water and has been studied by scientists as a effect in reducing levels of salt in urine. Ending2: It is occasionally sold as " water gel powder, " " slush powder, " or " instant solid powder. " [title] Put on some safety goggles. Ending3: If you are not yet certain of the weight the metal is listed as, then get 1 cup of sodium polyacrylate per gallon of water. [substeps] Sodium polyacrylate is sold in powdered forms at most pharmacies and some department retailers. Ending4: Sodium polyacrylate is almost completely salt-free and is found in various fabrics such as polyester, spandex, or silk. [substeps] It can be purchased online or through pharmacies.

Answer format: ending1/ending2/ending3/ending4