Pumpkin is a great natural source that will help with both diarrhea and constipation. For an adult cat with diarrhea start with feeding your cat a teaspoon of pureed pumpkin (plain, no sugars added) twice a day. If that does not help, you can increase each feeding to 1 1/2 teaspoons. Then 2 teaspoons if still not enough. Be careful though. Too much will go the other way and cause a constipated cat to go.
If your cat has diarrhea for a more than a day or two and is lethargic and not eating, consult a vet immediately. Even just a couple days without food and water can cause liver damage in a cat.
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Kaopectate. It wont hurt him if you give him a fraction of a human dose. You'll have to open his mouth, and carefully pour in a little. Don't worry if the whole amount doesn't get down his throat because just what he does swallow will be enough to thwart the trots.
Most medications for treating cats with digestive issues need a prescription. However, Fast Balance-GI is one that does not. You can find this medication online at pet supply companies.