Stop drinking so much water! (Or more accurately, overhydrate and underperform). Read this report.
“The critical takeaway: We all drink way too much water (and sports drinks), putting ourselves at risk of worse, not better athletic performance….mild dehydration, which is completely normal during exercise, corresponds to faster marathon event times across ages and skill sets…that if you drink when you’re thirsty rather than before, you’ll maintain perfectly adequate hydration. In fact, more experienced, and often faster runners in the study did just that and suffered much lower incidents of GI and other distress.”
This idea of “hydrate or die” sells a lot of bottled drinks and water bottles and bottle carriers and… but it is not necessary to have that much water/fluid.