Write and practise a drought plan

Every source can fail in a long drought. A written plan with trigger levels stops a slow problem becoming an emergency.

How

Set tank level triggers, for example normal, watch, restrict and emergency, each tied to actions.
At each trigger, cut uses in order: lawn and ornamentals first, then non-essential washing, then garden crops, then animals reduced to essentials. Keep the fire reserve locked.
Track monthly rainfall against median (Texas manual approach) and watch well levels if you can measure them.
Keep the emergency minimum from water-1 (at least 15 L per person per day per Sphere) as the absolute floor, and plan how many days storage covers at that rate.
In extreme heat or with sick people, raise that floor towards 20 L per person per day, as Sphere advises.
Identify backup sources in advance: a neighbour, a licensed water carter or a second well. Check legal arrangements with the legal module.
Follow drought guidance from your local water authority; US EPA WaterSense publishes drought water-saving tips.