Thicken glue

I bought some white, water based leatherworking glue from an online retailer here in Indonesia. But I think it's been "watered down". I bought some from them a while ago and it was nice and thick.
Any suggestions on how to thicken it up?
I need to do this tomorrow, as I'm working to a deadline. If I order some more (online), it'll be at least 4 days before it reaches me.