Exodus 12:33 The Egyptians were urgent with the people to send them out of the land in haste. For they said, “We shall all be dead.” So the people took their dough before it was leavened, their kneading bowls being bound up in their cloaks on their shoulders. The people of Israel had also done as Moses told them, for they had asked the Egyptians for silver and gold jewelry and for clothing. And the LORD had given the people favor in the sight of the Egyptians, so that they let them have what they asked. Thus they plundered the Egyptians. And the people of Israel journeyed from Rameses to Succoth, about six hundred thousand men on foot, besides women and children. A mixed multitude also went up with them, and very much livestock, both flocks and herds. And they baked unleavened cakes of the dough that they had brought out of Egypt, for it was not leavened, because they were thrust out of Egypt and could not wait, nor had they prepared any provisions for themselves. The time that the people of Israel lived in Egypt was 430 years. At the end of 430 years, on that very day, all the hosts of the LORD went out from the land of Egypt. It was a night of watching by the LORD, to bring them out of the land of Egypt; so this same night is a night of watching kept to the LORD by all the people of Israel throughout their generations.
The Egyptians feared that, if any further delay took place, the God of the Hebrews might not be content with slaying all the first-born, but might punish with death the whole nation, or at any rate all the males. It is easy to see how their desire to get rid of the Israelites would expedite matters, and enable all to set out upon the journey on the same day. The Lord gave the people favor in the sight of the Egyptians—Such a dread of them was inspired into the universal minds of the Egyptians, that whatever they asked was readily given. (Brown)
600,000 – This includes all the males who could march. The total number of the Israelites should therefore be calculated from the males above twelve or fourteen, and would therefore amount to somewhat more than two millions. This is not an excessive population for Goshen, nor does it exceed a reasonable estimate of the increase of the Israelites, including their numerous dependants. (Barnes)
So long the promise God made to Abraham lay dormant and unfulfilled, but now it revived, and things began to work toward the accomplishment of it. The first day of the march of Abraham’s seed toward Canaan was four hundred and thirty years (it should seem, to a day) from the promise made to Abraham, Genesis 12:2, “I will make of thee a great nation.” What reason have we then to admire the exact accomplishment of God’s promise! Notwithstanding the various revolutions and changes of all worldly affairs that must necessarily have happened in the space of four hundred and thirty years, yet God’s promise stands sure amidst them all. Yes, God’s word will stand fast for ever and ever! Heaven and earth may pass away, but his word cannot pass away. (Benson)
They had little provision for their exodus. They had unleavened dough and the flocks. There were no fast food stops, no grocery stores, no convenience stores, or no fresh produce markets, along the way. Their provision was God. Remember this when we get a bit further on into their exodus.