Ellis and her family of 4 will be traveling for 8 hours going and 8 hours coming home = <<8+8=16>>16 hours total.

Each person needs 1/2 a bottle of water each hour, so 1/2 a bottle x 16 hours = <<1/2*16=8>>8 bottles.

There are 4 people traveling so 8 total water bottles for each person x 4 people = <<8*4=32>>32 total water bottles.

# Answer

32
<|im_start|>system
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<|im_start|>user
Ellis is going to take a road trip with her family. First, she needs to figure out how many bottles of water she should bring for everyone. There will be four people total: Ellis, her mother, her sister, and her aunt. They will be on the road to their destination for 8 hours and drive 8 hours to return home. Every hour each person will want to drink 1/2 a bottle of water. How many water bottles will Ellis' family need total?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
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user
32
Ellis is going to take a road trip with her family. First, she needs to figure out how many bottles of water she should bring for everyone. There will be four people total: Ellis, her mother, her sister, and her aunt. They will be on the road to their destination for 8 hours and drive 8 hours to return home. Every hour each person will want to drink 1/2 a bottle of water. How many water bottles will Ellis' family need total?
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