Keeping a cold water battle on a hot day

 So I have a trick that I have learned when it comes to having ice cold water or gatorade on the first few hours of a hike. Take you plastic water bottle, and half fill it with whatever liquid that you love to hike with. Then put that in a freezer the night before a hike. Then in the morning, you take the water bottle out of the freezer then fill it the other half with water.

If you have a few hours to get to the starting location, I then put it in a cooler. When you get to the starting point, about another 1/3 of the ice will have melted and you will have very cold water. After about 3 hours on the trail most of the ice will have melted but you will have ice cold water for anywhere from 3 to 4 hours into the hike. 

Since Ice really does not take up that much more room, as far as i know there is no downsides.

If you want a fun thing to do take the plastic gatorade bottles and freeze them and then as you walk you bang the plastic bottle on some hard things. You will more of less have a gatorade slushy and its a wonderful treat when you are doing some hard hiking.