The hydrated solid can be dehydrated with heat or by azeotropic distillation. The system uses the reaction energy created when salts are hydrated or dehydrated. Dehydrated and frozen mashed potatoes are available. Rhubarb can be dehydrated and infused with fruit juice. Some recipes call for mashed potatoes, with others calling for dehydrated potato flakes. Nursing care and rehydration are used for dehydrated and anorexic cats. The ration makes extensive use of commercially available canned and dehydrated items. The peels can be dehydrated and used as gourmet flavoring with salt and sugar. Dates can also be dehydrated, ground and mixed with grain to form a nutritious stockfeed. "Kao fu" is available in fresh, frozen, dehydrated, and canned forms. Antibiotics improve outcomes in those who are both severely and not severely dehydrated. This dihydrate can be dehydrated to anhydrous using acetic anhydride. Two molecules of lactic acid can be dehydrated to the lactone lactide. Hash browns are a popular mass-produced product sold in refrigerated, frozen and dehydrated forms. After being crushed, this product is dehydrated in a rotary oven.