Mindful of water pollution in Rio, U.S. equestrian team gives horses filtered water

2016 Rio Summer Olympics: Keep track of all the Rio Olympics news Aug. 1, 2016, 7:25 a.m. Full coverage of the 2016 Summer Olympics in Rio. 6:59 A.M. reporting from Rio DE Janeiro Mindful of water pollution in Rio, U.S. equestrian team gives horses filtered water David Wharton Mindful of water...