Should I put labels on bottled water served at wedding?

I want to have bottled water available for my guests at the sign in table because it will probably be very hot on the day of my outdoor wedding. However, I cannot afford to buy the wedding water with the personalized labels on it. I also thought about doing my own labels but I know they would run when they got wet. I thought about getting the monogram stickers to go on the caps of the bottles, but I don't know if that would be tacky... What do you think, would it be ok to just serve it with the company labels on it?