Trailer Tip Tuesday, 
Summer Equine Transport,
On average, horses need at least 5 gallons of water per day for body maintenance. This can easily double or triple when they’re working hard in hot weather or being hauled in trailers. Bring water from home when you’re traveling, as some horses are picky about unfamiliar-tasting water, or acclimate your horse to water flavored with a little apple juice or Gatorade ahead of time. These can effectively mask strange-tasting water while on the road. If a horse is exhausted or very hot, offer one gallon of water every 15 minutes until he has had his fill. 
Stopping frequently to offer water is essential on these hot summer days. 
If you can, travel in the evening or early morning, avoid traveling in the heat of the day.