In addition to the numerous water bottles and bladders on display, a few other interesting hydration options stood out (note that I said interesting, not practical!) at Outdoor Retailer Winter Market:
Oxsitis

Oxsitis hydration system
AGS Labs, distributor of Esbit solid fuel stoves, among other things, is in conversations with the French manufacturer of Oxsitis hydration products. The Oxsitis system consists of a hydration pack, bladder, and nutrient/electrolyte solution.
It's unique because the nutrient solution is placed between the bladder and the delivery hose, in line with the flow of water out of the bladder. This means that the nutrient/electrolyte solution never enters the bladder itself, preventing flavor-transfer and mold.
The distribution agreement isn't final, so no word yet on when the product will be available to consumers.
Weight: 400 g
Volume: 2 liters
Material: PVC, PE
Snow Peak

Snow Peak Titanium Kanpai Bottle.
Snow Peak showed us the prototype of its double-walled titanium Kanpai (Japanese for "cheers!") bottle. The ingenious Kanpai bottle fits over a 12- or 16-ounce can of your favorite beverage.
Three different lids convert the Kanpai bottle into a drinking mug, a sealed thermos for hot liquids, and a cooler with a frozen gel insert.
The Kanpai is presently available in a stainless steel version.
Titanium Kanpai Bottle
Weight: 9.2 oz
Available: September 1, 2011
MSRP: $159
Hydro Flask
Hydro Flask may have taken stainless steel bottles to their logical conclusion with the Growler. This behemoth holds 64 ounces of a favorite beverage in a secure, wide-mouth, double-walled, stainless steel bottle (that can't comfortably be held with one hand). It keeps cold beverages cold for 24 hours and hot beverages hot for 12 hours.
Growler
Capacity: 64 oz
Material: Stainless steel
Available: March 2011
MSRP: $50
Andi Muzzioli showed us the Hydro Flask Growler at Outdoor Retailer Winter Market 2011.