One thing that bothered me a lot in that book was the trio hiding out in the wilderness scrounging for food. They could do magic! How hard was it to sneak into

One thing that bothered me a lot in that book was the trio hiding out in the wilderness scrounging for food. They could do magic! How hard was it to sneak into a muggle supermarket and steal some food?! Or lie low at some pre-arranged safe houses? Could have had Dobby bring supplies. I don't know how effective Taboo ambush tactics would be in the long run but not finishing off death eaters and letting them respawn was definitely a bad move tactically. Should have atleast dumped them all in a fidelius charmed warehouse or something in a Stunned state.