Training days need more water than rest days, and the gap is where most people fall short. A goal that changes by day and a count kept by text makes it simple.

Most people do not fail to drink water because they dislike it. They forget, for hours. A plan that works with a bad memory: two texts a day and a count.

We converted CDC data on sugar-sweetened drinks into cans per year. The average US adult drinks the calorie equivalent of 355 cans of cola annually.

Federal survey data shows most adults are only about one glass short of the recommended intake, but some groups are three glasses short every day.

Urine tests in a national survey found 32.6 percent of adults under-hydrated, about 63 million people. Most feel it as fatigue, not thirst.