I would recommend using a cottonball with iodine (or peroxide if no other wound cleaner is available) to gently dab at the wound. if you use peroxide it will bubble a lot, that means it is working.How much does it need to drink? I can get it to drink a mouthful if I gently dip its beak or put a drop on its beak.
I'm not very comfortable cleaning the wound without more instruction. I am fine around blood and things but I'm just not sure how o go about cleaning it.