Her first drink consumed 1/4 * 4 = <<1/4*4=1>>1 liter of water.
Thus there were 4 - 1 = <<4-1=3>>3 liters of water left in the bottle.
Next, she drank 2/3 * 3 = <<2/3*3=2>>2 liters.
Thus, there were 3 - 2 = <<3-2=1>>1 liters remaining.
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