The booth reminds us of when we traveled in the wilderness, and God took care of us all the way. We trust in God to care for us. Because really it's God's story, and the God who brought the people out of slavery in Egypt is the same God who brought us back home from our captivity. That's why we sing this psalm about it. I especially like the part about the springs and the cooling waters.
Booths are an important part of the feast of booths, but so is water.
But I was telling you about the water. For the temple celebration, the priests drew a pitcher of water from the pool of Siloam. Like so many other traditions, it also carried a deeper spiritual meaning. The pouring of the water was a demonstration of Israel's hope for the coming of the Messiah and the outpouring of the Holy Spirit, whom God had promised. A new day has come.