I heard a story a while ago about a facility working with a lot of molten sodium. The whole building had no running water at all, no bathrooms even, because water and sodium mixing is a problem.

Lithium doesn't seem a whole lot safer.. but I don't think a fusion power plant could be water free. As far as I'm aware there is no more efficient method of using heat to spin a generator than a steam turbine. A lithium/water heat exchanger seems pretty frightening. Do they have a better plan for that?