[cypher]

I'm not sure which ones are available in the US, you can use just a very tiny amount of human probiotics or have a look for the ones marketed for birds, the dosage is usually a bit closer to what a ham would need than those sold for larger animals.
If it's in powder form I usually just put a tiny pinch on some fresh veg, or any wet food so it sticks! They generally seem to enjoy it so no problem getting them to take it.
I really don't recommend putting it in water.