Leave sugary sports drinks in the dust. Kate Hudson and Jennifer Garner hydrate with vitamin-rich Propel Fitness Water, now in powder form (20 calories; $3.50 for 10; at drugstores). Lindsay Lohan recharges with the amino acids and electrolytes in Amino Vital Mix-and-Shake (15 calories, $10 for 5; amino-vital.com. And Luna Elixir delivers antioxidants (50 calories, $1; drugstore.com.