In some situations an enema may be the only effective way to maintain minimum hydration and get nutrients or drugs into the system. People have at times been so seasick that they weaken simply from lack of food and water. An enema of weak oatmeal gruel can get them the calories and water necessary to keep them alive. Likewise many pills can be ground up, mixed with water and administered as an enema.

Extreme nausea is the most common reason for seeking out other ways but esophageal swelling or burns, and the chance they might choke on what you try to feed them, can be reason enough.

It isn't the most convenient, or pleasant way of serving, or receiving, a meal but it works and should be kept in mind when considering options.