You cannot mix the moconazole in water as it will dilute it and you may as well not treat at all for all the good it will do. However, you can get creative and stuff the dose inside a treat. The pet food aisle actually sells "pill pockets". Or you can look for them online. Most any vet office also sells them. They are hollow bite size treats, usually for dogs and cats, and you can stuff the miconazole dose inside, then offer it as a treat. Some folks use a small bit of bread or something that can be molded around the dose.
With practice, one person can do the work of two. I use a towel to wrap my patient's wings and feet to completely immobilize them so they can't struggle. Then I use both hands to pry open the beak and then slip a finger inside to keep it open while using my other hand to stuff the med in.
All chicken keepers should be outfitted with at least three arms and hands. It would solve so many problems.