Not cool, mom

Just put a plastic cup inside and vwala

Tape it up.

You need to appeal to your engineer side

Challenge Accepted.

You can always use the cup for crushing up your coke into fishscale powder

put a bottle liner into it

Get one of those waste paper baskets just like it, ask if that "cup" is also OK. Then put in a plastic liner and use it to mix up cocktailes.

http://www.getflexseal.com/?tag=im|sm|go|tm&a_aid=011&a_bid=a4cc8494

And when you have a leaky cup.....flex-seal