what does it mean, i can't understand
In a movie, one said "Double Old Kentucky, straight with a water back. Make that two backs." what does "water back" mean? I just can't get it

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It means two shots of water. A shot is a serving size equivalent to one ounce (about 30 cubic centimeters) .  He wants two shots of Od Kentucky whiskey (that is why he said "double") mixed with two shots of water.

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Thanks a lot!

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Sorry, in my answer I said he wants the water mixed with the whiskey.  He wants the water in a separate glass.  He intends to drink the whiskey "straight" or "neat" meaning mixed with nothing and no ice.  He will then drink the water.

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也许是是水袋的意思？背在背上的水袋？你和上下文理解下看看对不对 0 0 。。。