Here is the letter from the vet:
I received your email from this morning and would be happy to respond as Dr. *Blank*is out of the office for the next few weeks.
The best way to combat colic is to keep your horse sufficiently hydrated, offering access to plenty of water for them to drink. In many instances a second bucket of water hung in the stall will allow them a backup supply if the first is finished before the horse is watered again. The key is having more water than they will be able to drink as the last thing you want is a thirsty horse without any water. Ensuring plenty of water will decrease the likelihood of colic due to impaction.
Let me know if there is anything else I can help,
"My treasures do not clink together or glitter; They gleam in the sun and neigh in the night."