A very good premise simply sinks in the Hollywood hot tub.To save young Jeff from the slammer, his parents get him a job mixing plumbing with pleasure in the Hollywood hot tubs. Everything that can be done to, with, for, in or around hot water finds its way into a plot that goes from the quick and the dirty to the gothic. Each half-hour delivers a coupling in this not-too-funny comedy full of booze, broads and bubbles. The final party offers lookalikes of Burt Reynolds, Lauren Bacall and Bozo. Only the last is convincing. The kids, at whom this pic is aimed, witness more sex than they enjoy. The most promising moments come with Jewel Shepard, who takes the valley girl far beyond its usual dips.