Ears need to be carefully handled when dirt appears. Washing a cat who loves water is easy. The main thing is to do this not too often (but, of course, after each walk) and using the means approved by veterinarians.
The best option is premium industrial feed, which maintains the ideal balance of nutrients, vitamins, and trace elements. They should not be combined with other food. A natural diet, if you are a supporter of it, should be 80-85% meat (chicken, veal, rabbit, lamb) and offal. Please note that dishes from the host's table can provoke serious problems with the gastrointestinal tract.
Bengal cats prefer fresh running water, so it is better to immediately purchase a special "fountain".
The only weak point is the stomach, but a balanced diet can easily solve this problem.