Matthew Poole and continuators on Exodus 7:25

25 And seven dayes were fulfilled after that the LORD had smitten the river.

Ere all the waters of Egypt were perfectly free from this infection. Quest. How could the Egyptians subsist so long without water! Ans. 1. Philo tells us, that many of them died of this plague. 2. As the plague might come on, so it might go off by degrees, and so the water, though mixed with blood, might give them some relief. 3. The juyces of herbs, and other liquors, which were untouched with this plague, might refresh them. 4. They might have some water, either from their pits, or by rain from heaven, as was said before; or from Goshen: for though it be said, that the blood was in all their vessels, ver. 19. yet it is not said, that all that should afterwards be put into them, should be turned into blood.