Chilled Water on Your Tour
No need to spend $15 for an insulated water bottle that holds half the water.
An old sock works much better and is cheaper.
And if you have two water bottles, you can use the pair.
Just put the water bottle in the sock, keep the sock wet, and your water stays cool.
Out West, where the air is really dry, your water will be cold.
It's called evaporative cooling - and it works.