Would he take liquid from the type of water bottles you use in cages and hutches for small animals? Until then, could you use a straw like a pipette? - putting your finger on the top and releasing it when letting the water out? Sorry if that's a daft idea, but it's the only one I can think of that would contain the water, although you would have to keep filling it alot.
Your poor little cat - fuzzy hugs to you both

Lavender
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