How much fun would that be?
I gues ... none? O_o
I mean logically ...
You are complaining that food managed to limit nothing ... bcs there is so much of it ... so it effectivelly "just adds extra clicks".
So if there would be as you said need to "go back to Druid Grove to buy more before resting" ... you would still not limit anything, just adding yet another extra clics in order to rest. O_o
And add yet another anoyance by forcing players to run back and forth between any food vendor and their curent location.
And what about those who kill the grove?