On the ground floor of the Hospital, in the far northern corner, you can find some toilets; inside one of the water tanks, closest to the window, you can find three bottles of vodka. The can be a bit tricky to actually get; stand next to the tank, close to the wall, and jump up and down while spamming the "Use" key and you should be able to pick them up.

Thanks to angrydog for his assistance once again!