Survival is utterly useless, you'll find plenty food and drink along the way.
don't listen to this man.
he clearly has never experienced by what margins high lvl crafted food will outclass stimpacks and purchased food itmes.
in addition, the higher the survival skill, the higher the effects from everything food-related consumed. that also counts for effects like extra DT or AP.
nuka cola quartz: +2 DT with a low surival skill, + 5DT @80
nuka cola victory: +10 AP at low skill, + 26AP @ 80, just to give you a glimpse of the magnitude
survival is an AWESOME skill in HC mode. make sure to have it at 75 in the later stages of the game.