I came across spearmint water by mistake.
I had saved some spearmint sprigs in a jar in the refrigerator for a friend's garden. When she was delayed picking up the spearmint sprigs, I happened to taste the water and found it wonderfully refreshing.
Pick spearmint early in the morning; add to water and refrigerate. By noon, you'll have delicious, refreshing water.
Pour it into a plastic bottle to take with you. No sugar or sweetener required, drink as is!