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Me and my wife are planning a trip .... I will need to carry water and food with me.
...and what's your wife carrying?
Seriously...backpack of course, two bodies (one in the backpack), never more than 4 lenses: 100-400 or 70-200, 16-35 or 24 TS, 100 macro, 24-70 (usually mounted on the outside camera clipped to the backpack harness with a carabiner) Lee filter system (in a belt pouch), various doo-dads in the backpack (spare cards, batteries, cable release, plastic bags, Seal-Line water proof duffel type bag that the whole backpack fits into, and tripod.
And my wife carries the water and other victuals in her backpack.
On my first trip to Zion I walked around for a few hours with two cameras around my neck...until I realized I must've looked like a complete dork.
Have a great trip, but remember to check out other, less traveled parts of Zion and surroundings.