It's a hot day in the park today and the kids are hot. When Barney arr ives, he teaches the kids the importance of water - to keep things gro wing and to stay cool. After they water the plants in the park, the ki ds go in and make lemonade. After the sweet drink, Barney and BJ teach the kids to brush their teeth. Back outside, Barney and the gang imag ine a pool and go swimming to cool down. Poor BJ doesn't get to go swi mming because Barney splashed all the water out of the pool.