Places to fill with fresh water and clever ways to fill ..

You just need to get brave. I only remember one time I was refused water in due too meaness or policy in my travels. All buildings have outside spigots. You just need to be confident enough to walk into a business, be it a store,gas station,church,diner,whatever,and ask. Cemeteries usually will have spigots available.
I once even stopped and asked a woman watering her lawn if I could fill up.
Just get brave.