The Third Bowl of Wrath

"Then the third [angel] emptied out his bowl into the rivers and the springs of water, and they turned into (became) blood. And I also heard the angel of the waters say, Righteous (just) are You in these Your decisions and judgments, You Who are and were, O Holy One! Because they have poured out the blood of Your people (the saints) and the prophets, and You have given them blood to drink. Such is their due [they deserve it]! And [from] the altar I heard [the] cry, Yes, Lord God the Omnipotent, Your judgments (sentences, decisions) are true and just and righteous!" (Revelation 16:4-7 - Amplified Bible)

With the pouring out of the third bowl, God miraculously changes all rivers and fountains into blood. Fresh water will be almost impossible to find. An angel praises God for this judgment because it is fitting. The Anti-Christ and his followers have shed the blood of many people. Now they must drink blood. The wicked people of the earth are worthy to receive such punishment.

This reminds us that although God's wrath is terrible, it is also appropriate. It is what sinful man deserves. God is willing to forgive all people, but those who refuse to turn to him face judgment for their rebellion.