On a recent trip to the convenience​ store, you picked up gallons of​ milk, bottles of​ water, and ​snack-size bags of chips. Your total bill​ (before tax) was ​$. If a bottle of water costs twice as much as a bag of​ chips, and a gallon of milk costs ​$ more than a bottle of​ water, how much does each item​ cost? How much does a​ snack-size bag of chips​ cost?