Re: "stuff" logistics
I take an old backpack that I used for school years ago. I "always" have a first aid kit in it as well as a water filtration system. Then goes in the water bottle, lunch, flies, and anything else I probably won't need but makes me feel prepared (Boy Scouts #524!).
As for hiking, I'll usually just wear my wading boots, unless the terrain is a bit challenging. Then it's sneakers or boots.