Give the essentials a home
A small bag works best when it has a consistent job. Pick a place for cleanup bags, a towel, water and your chosen portable bowl. Add only the items appropriate for your dog and the outing. The goal is to find what you need without emptying everything onto a bench.
Pack for the actual outing
Lay out the contents before leaving and consider what you will use, what you will carry home and what needs cleaning afterward. A bag that is easy to empty is easier to keep ready for next time.
Check the condition and fit of walking equipment as part of the same routine. Follow your veterinarian's guidance about suitable activity and conditions for your dog.
Reset when you get home
Refill supplies, clean and dry the bowl according to its instructions, and put everything back in its usual pocket. This small reset makes the next departure easier.