I always carry water in my SUV. I'm retired and it's garaged so no worries about freezing. I keep a case of bottled water in a plastic container for emergency use or if I forget water. For daily use I keep several plastic nalgenes and stainless bottles in the rig for me and my dogs, who are usually with me.

For hiking, the dogs are always with me and we carry three of the stainless bottles with neopreme sleeves. I have a dog backpack with a built in bladder but the thing just covers up too much of the dog in the warm weather. Looking for smaller dog packs for warmer weather. My hiking is usually within a mile of my rig or house.

I try to buy brands that are dishwasher safe. Run them through at least weekly in the winter and more often in warm weather.