boulder-strewn gorge:
what ancient waters could move
what now can't be budged?
River Boulders [Haiku]
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Digestible non-toxic protein, digestible non-toxic fats, and digestible non-toxic carbohydrates.
Also, water and air, but they are non-commoditized (to a large extent, anyhow.)
Also, certain vitamins and minerals, but they would be subsumed in a good mix of the aforementioned three.

creek that trickles
through a stark winterscape —
days from riverhood.
Water. Far and away. Nothing else comes close by volume consumed.
Unless this is one of those instances where “drink” is code for alcoholic beverage — in which case the answer is pilsner or gin, as the mood strikes.