I make a smoothie with carrots apples water oats and a bit of molasses and then blend it and freeze it my horse loves me for that. 😁
I fill up a bucket of water about half way (for a large one, if I want small individual treats I use an ice tray).
1.) Molasses (or honey)
2.) shredded carrots
3.) cut up apples
etc (add what you want, and what your horse will eat (personally add carrots, apples and sometimes blueberries and/or watermelon))