I keep at least one bottle (refillable type) in the car to have water on hand at all times. Stainless steel or BPA-free water bottles are ideal. Of course, these bottles will get hot if left sitting in the car for any period of time. With some planning, doing a semi-freeze or adding lots of ice cubes to the water bottle will help keep it cool in hot weather.
Bowls and Waterers for Dogs on The GoMy favorite is a collapsible pet bowl (compare prices) because it is an easy item to keep stashed in the glove box or with your supply of fresh water. I particularly like the silicone dishes, since they are waterproof and easy to clean. (compare prices)
There are many types of water bowls for dogs on the go - spill-less bowls, travel bottle/bowl combos, even bottles with ball valves - no bowl needed. What works best for you and your dog depends on personal style and what you will be doing - hiking, city walks, relaxing at the park - will help make the decision on what will be most useful in the long run.
Bowls and Waterers for Home and YardI have several pets and use a refillable pet waterer in the house, similar to this one, as the main watering hole. I also have smaller dishes for the cats, who sometimes prefer their own non-dog water. Although, sometimes it is the kitties who play in the water.
For outdoor home use, waterers that automatically fill from a faucet are ideal, since they are less likely to tip over and the bowl stays full and fresh. (compare styles and prices)
Whatever type of dog watering device you select, fresh water is important for all dogs, all year round. Dogs, especially elderly and short-nosed ones, are sensitive to heat and may be more prone to heat stroke. Having fresh cool water available at all times is part of keeping your pet safe in summer heat.