(NSFW) How do I clean myself when I am 300 pounds?

It is hard to be 6’5 300 pounds and find it difficult to clean myself after a crap… without getting shit on my hands. sometimes I have to stand and wipe, But I need to sit to finish. What should I do to clean myself. The best I can do is to put water on my toilet paper. I would like to use a beach towel to clean myself with. I am on medication the makes me gain weight.. My food is from meals on wheals for lunch and take out for supper and fiber cereal for breakfast. I’m looking for advice on cleaning myself not losing weight .