This verse (see Exodus 13:20-22; 14:19-20; 40:36-37) focuses on the fact that after the Israelites left Egypt, for the next forty years, God provided a cloud covering through a very hot desert and also a fire to keep warm at night. The point is that God cares for them and us even when we go through a difficult time.
 The people asked, and He brought quails, and satisfied them with the bread of heaven.
 He opened the rock, and the waters gushed out; they ran in the dry places like a river.
These verses point out different moments during the 40 years the Israelites wandered in the desert and how God miraculously provided food and water for them in a desert. There was quail for the Israelites when they complained about the manna from heaven (Exodus 16:4, Numbers 11:4-35), and He also gave them water from a rock (Exodus 17:1-7, Numbers 20:9-11).
Does that mean we should expect miracles from God in order to survive? If you think about it, every day for the Christian is in effect a miracle from Him. After all, if God has given me the ability to work then I should work to provide for myself (and my family). God will not do for us what He expects us to do for ourselves. At the same time, God may choose to do the incredible at times in order to make His will and way known to mankind.