Get one for food and one for beverages. Icepacks, frozen waterfilled bottles (for nice cold water on the river) in one so it's semi-dry and you don't have floating bacon and a bigger one haha with ice cubes etc for your beverages.
If you can, freeze food items for the later days. That helps to keep everything cool as well.
I use this one. I also used it as a "suitcase" for my trip to Costa Rica. I have had it for over 10 years and I camp a LOT!!
http://www.cabelas.com/product/Coleman174-...ch-All+Products
If, by chance, you stop by the "Cutty Hut".....I usually have 2 big coolers full of ice for beverages. I might have some room for disco's!!