Runners should ensure they consume / drink enough water during a half marathon. Adequate hydration is important for completing a half marathon successfully.
Pre Race Hydration Tips
Pre-race, don’t drink or do anything that could promote dehydration: these include drinking excess caffeine, alcohol or soaking yourself in a hot tub.
On the morning of the race make sure you drink atleast half a litre of water before the start of the race.
During the race itself dont indulge in unnecessary water drinking, too much water is dangerous! Take a drink only when you feel thirsty.