Brian has 64 water bottles for the 5K race participants. In addition, he is planning to buy some boxes of water bottles that have 14 water bottles each. All of the boxes cost the same. Brian can buy up to 5 water bottles given the amount of money he has. Let x represents the number of boxes of water bottles Brian buys. Write a function rule to describe how many water bottles Brian will have based on the number of boxes he buys. Find a reasonable range for the function.