There is more important thing than food and water

Exodus 17:1-7
Israelites quarreled and tested the Loads for they were thirsty for water ,camped at Rephidim.
Israelite they grumbled against Moses, and almost ready to stone him.
Israelite tested the Load saying, " Is the Load among us or not?"
God talk to Moses take in his hand with the staff which he strike the Nile to strike the rock in sight of the elders of Israel. The water came out of the rock. Moses stroke rock to get water twice on the way travel in desert.
Why?
Each time when Israelite hungry and thirsty they grumbled and quarreled with Moses.
Israelites quarreled with Moses is quarreled with the Load.
The Load using Manna tested Isrealites, they did not passed, but they tested the Load for water.
How?
Human's heart is rebellion to the Load. We always wonder Is God among us or not?
I believe even God did not do anything He is always with me. Holy Spirit is always is dwelling in me.
Food & water are not the most important thing, most important thing is obey the command & laws of the God, eating the spiritual food let my heart not hungry.