Forget about all the candy bars, cheese, jerky etcetera that y'all carry on a cave trip, this Baskin Robbins Heath Shake<http://www.baskinrobbins.com/Nutrition/Product.aspx?Category=Beverages&id=BV228>should be enough to take you through the hardest of death marches and best of all, it fits right in a nalgene bottle. it clocks at over 2300 calories. WANT!!!
and then there's the nay sayers at Consumerist<http://consumerist.com/5052633/baskin-robbins-death-shake-has-2300-calories>who say you shouldnt drink this "death shake" thoughts? Nico
