Hostile Environment (1999)

Toxic waste has contaminated the world's fresh water supply. A select few with the ability to de-contaminate the supply now control the world. Minna rules the de-contaminators from a giant warship, forcing desperate land dwellers to trade anything and everything for meager water rations. The dwellers seek a leader to battle Minna's tyrannical rule. Jennifer, daughter of the rebel leader, implores outcast Mike Erikson to lead the battle against the warship. Help also comes from an unexpected source in the from of Jennifer's brother Rocky.