Blood Drip

We are looking for a way to make blood drip in the center of our stage
for a production of The Scottish Play. We need to have control over
the amount and size of each drip, time between drips, and we need very
accurate start and stops of the dripping. The drops would come from
the grid, 20 feet above the stage. The closest I can get an operator
to the drop destination is 43 feet away. Any ideas on how to achieve
this effect?