There are a number of alternative sources of water.
A main one is the large cooling pond next to the site that by design is kept above the height of the reservoir. As the reactors have been shut down for many months it is estimated that this pond will be sufficient to provide water for cooling for some months. The Agency will confirm this very shortly.
It is therefore vital that this cooling pond remains intact. Nothing must be done to potentially undermine its integrity.
IAEA Director General Statement to the IAEA Board of Governors | IAEA