<human>:  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?
<bot>: How many hours will they be on the road? ** Ellis and her family of 4 will be traveling for 8 hours going and 8 hours coming home = <<8+8=16>>16 hours total.
How many bottles of water will each person need? ** 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.
How many water bottles will Ellis' family need total? ** There are 4 people traveling so 8 total water bottles for each person x 4 people = <<8*4=32>>32 total water bottles.
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