Nothing. You can still supply your household with potable water during a drought. You just need to stay on top of monitoring your rainwater supply.
If the rainwater harvesting system was designed properly and is collecting from as much of the roof surfaces from your house, you will buffer the risk of running out of rainwater. Often, you will head into a drought with a relatively full cistern of rainwater. Even during a drought, we still get rain so there will be opportunities to replenish the rainwater volume in your cistern.
If the drought persists, then you can always call a local bulk water hauler to fill your cistern with hauled potable water so that you can bridge the gap between rain events.
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