I've got some suggestions, so long as you don't mind it not being in bright colors and full of happy fun smily images.

If all you need it to do is to hold a pair of nalgenes, the SAW pouch from SpecOps Brand and the Patriot Performance Matierals "Multipurpose Pouch" (its the same size) both hold a pair of them easily enough. The one from SOB uses thier "fast-back" system, and I've used that with everything from 1" straps to 2.25" ALICE webbing; the PPM uses MALICE clips and those can be set up for a 1.5" belt without trouble. I'm not sure about some of the other pouches that hold the 200 pack for the Minimi, haven't tried vary many, but I know the old ALICE one doesn't becuase of the stiffeners in the sides.

Most dump pouches wil manage.

If you are wanting one with a pack in the middle, look at the Maxpedition Devildog. I don't think the SpecOps SOB will hold Nalgenes, but it will hold a pair of USGI one quarts, but they haven't updated the mounting from ALICE so it isn't as adaptable to what you can put it on.