Melissa from Melly Sews shares a tutorial at Riley Blake Designs showing how to make her for making her Little Camper Water Bottle Holder. She designed the water bottle holder for her son to carry to day camp, so he could keep a bottle of water with him during outdoor activities. The long cross body strap is comfortable to wear. You could also increase the length of the strap to make this for adults. Go to Riley Blake Designs to find her tutorial.
[photo from Melly Sews on Riley Blake Designs]