Yes you can. Be careful depressing the plunger. It can go more difficult when the oil is passing through, then speed up too fast if your not careful when the water comes through it.
I was always under the impression not to mix water and oil bases. I heard the two different soluables can increase risk of a sebaceous cyst? But I would trust tee so good to know.
Nothing will come of harm to you. The most i believe will happen is that it can kinda clump up...other than that nothing physical will happen to you. But you can always just drink your winny