What's is the name of the movie from the 1990's that features teenage jocks and cheerleaders using syringes to keep themselves immortal and they also try to convince another teen to do the same. There's a scene where they all crash into a tree and use the syringes to keep themselves alive

I am trying to find the name of a movie where there is a guy and girl on a date in a community garden and they have pizza, and he spills something I think its soda on her dress and he says I owe you a new dress, and then they end up in a water fight with the hose and he walks her home.