If the box has four dozen bottles of water, there are 4*12 = <<4*12=48>>48 bottles of water in the box
After the first half, the 11 players take 11*2 = <<11*2=22>>22 bottles of water from the box.
If they take 11 more bottles of water at the end of the game, the number increases to 22+11 = 33 bottles of water taken
Without the bottles taken, there are 48-33 =<<48-33=15>>15 bottles of water remaining in the box
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