My parents have one that we used as kids if you get desperate Lu. How about those jugs with the rubber side, that forms a watertight rim against their forehead? I've seen them in BigW - do you know what I'm talking about?
We have one of those jugs and it works wonders. DD hates getting water on her face but she lets us use this and no water gets past the rubber side. Toys R Us sell them too.