Albert Barnes Commentary 2 Kings 18:31

"Hearken not to Hezekiah: for thus saith the king of Assyria, Make your peace with me, and come out to me; and eat ye every one of his vine, and every one of his fig-tree, and drink ye every one the waters of his own cistern;" — 2 Kings 18:31 (ASV)

Make an agreement ... - Rather, “Make peace with me.” The word, which primarily means “blessing,” and secondarily “a gift,” also has the meaning of “peace,” though more rarely. It probably acquired this meaning from the fact that peace was commonly purchased by presents.

eat ... drink - This is a picture of a time of quiet and prosperity, a time when each man might enjoy the fruits of his land without any fear of the spoiler’s violence. The words are in contrast with the latter part of 2 Kings 18:27.

Cistern - This should be translated as “well” (Deuteronomy 6:11). Each cultivator in Palestine has a well dug in some part of his ground, from which he draws water for his own use. Cisterns, or reservoirs for rainwater, are comparatively rare.