Ice in the water bowl wouldn't hurt. My boy likes to eat the ice out of his bowl as a treat, like he is bobbing for apples, he just loves ice. It is a nice treat.
I agree with the others, a kiddie pool, cool fresh water, a misting bottle, spot in the shade, soaked in water bandana, not going outside during peak hot sun times, all of those are good suggestions. Playing hard in the middle of the peak heat hours is not a good idea in high temps like that. I also find it wears dogs down fast, the heat, and they would much rather prefer to lounge on the couch where it is cool.
I freeze Kong’s & bones, and make frozen ice type treats (made with low sodium chicken stock) for extra enjoyment. You just pour the chicken stock in a container and make fun shapes, as large or small as you want. If you have a puppy (or an adult that doesn’t tear up toys) you can soak a rag in cold water and put it in the freezer, works great for teething and cooling down a puppy.
I also play a game I call “hose”, where I spray the water with either a sprayer or by hand, not only it is a fun game, it also helps cool off. My friends have an outside mister they attach to the hose for their dogs; it sits upright and does feel good to both humans and dogs in the heat. I really like that idea too.
For hikes a quick dip and swim in a pond or stream is helpful too. During lake trips swimming to cool down is especially important. When we are hiking or out at the lake multiple resting breaks are required as well as large amounts of fresh water and frequent swims.
I also place a fan on the ground inside the house just in case a quick cool down is needed, as well as have multiple fresh water dishes around in different rooms/places in the house.