Water will not make you tired. A sudden carbohydrate load will release insulin that potentially leads to post-prandial hypoglycemia and fatigue. Your best bet is to drink plenty of fluids throughout the day, not when you're thirsty. Snacking is better than large meals to avoid the carb load and crash effect described above. Power bars tend to have a good mix of carbs, proteins, and fats to give you a more balanced boost than eating a ton of Skittles and hoping for the best.
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2013 Cadillac V-Wagon, RIP Z
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