What is a good way to force feed a cat hard food? Also for water.?

We had to put one cat down because of fatty liver disease, and our what was once larger cat has stopped eating and drinking. She has lost a lot of weight. She had never touched soft food, and has only ever ate hard food so I want to force feed what shes used to.
Update: I'm currently not working so can't really afford the vet. Eating and drinking is the only thing to help if fatty liver disease is what she has. So force feed would be necessary. Thats why they'd end up doing at the vet.
Update 2: She had lost most the weight before we put the other cat down so this was a problem before that happened.
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