Convenient trail waterer: use a shower cap, which can be compressed very small. Put it in a baggie so holes don't get rubbed in it.

Safe-T-Mount: To get on a horse that might move away while you're poised vulnerably with one foot in the stirrup, as you spring up, lay your torso out across the saddle with your head as far over the far side as possible. While swinging your right leg over, keep your torso horizontal as it rotates to the left. Straighten up only when your right leg is down on the right side. This way your center of gravity will always be close to the horse's spine, and even if it moves off before your right leg is across its back you can actually stay on, or easily disengage your left foot and drop down.