Easy version for keeping reminder files up to date and mobile friendly: OneNote.
I believe OneNote is free and you can sync your notebooks with multiple sharing services. I do have a OneDrive subscription so that works for me, but MS Office for iOS will work with several other services, including DropBox. It's what I use for things like shopping lists, auto bill pay lists, inventories of certain things like games, recipes, and random notes. It would work a treat with a paint list.