إِنْ تَمَّ الْفَحْصُ فَالْمَاءُ غَدًا.
If inspection finishes, the water will be available tomorrow.
The compressed answer fa-l-māʾu ghadan relies on context for a predicate such as 'available' or 'supplied'. One should not pretend that a single exact omitted word is established in every reading; the reconstruction depends on the intended practical message.
Elliptical concision succeeds when contextual evidence sufficiently fixes the omitted sense. If the audience cannot tell whether availability, delivery or storage is intended, fuller wording becomes rhetorically superior.