The LORD guided them by a pillar of cloud during the day and a pillar of fire at night. That way they could travel whether it was day or night. And the LORD did not remove the pillar of cloud or pillar of fire from their sight.
Exodus 13:21-22 NLT

Then Moses led the people of Israel away from the Red Sea, and they moved out into the Shur Desert. They traveled in this desert for three days without water. When they came to Marah, they finally found water. But the people couldn't drink it because it was bitter. (That is why the place was called Marah, which means "bitter.") Then the people turned against Moses. "What are we going to drink?" they demanded. So Moses cried out to the LORD for help, and the LORD showed him a branch. Moses took the branch and threw it into the water. This made the water good to drink…
Exodus 15:22-25 NLT

The Israelites were to move when the cloud is moving and stay when the cloud stays. It was the same with the pillar of fire at nights. This was a form of God leading them. A foretaste/foreshadow of God leading us in this dispensation by his spirit at work within us.
Moses and his compatriots have had stops at some 'bus stops' designated by the cloud before this 'bus stop' at Marah. They have been on a long journey in an unfriendly environment and weather conditions. When you go on a journey under such conditions by no sophisticated means of transport but by foot, what you look forward to is a rendezvous sort of 'bus stop' where you can be refreshed, get something to drink at the least.
However, they saw Moses stopped at the water that could not be drunk because of its bitterness. Moses did not stop here, the cloud did.
God led them on their journey to Canaan to stop for a while by bitter water.
Some on their journey of destiny are presently being led by the Holy Spirit to similar 'bus stops' as this. Bitter!
Questions arise from the individual and onlookers, "Are you sure this is God?" To the rational mind, this leading is not God. How can a good God lead you to bitter waters?
Some are working in places they believed they were led to by God, but has found unpleasant.
Some have picked career paths they believed they were led to by God, but has found unpleasant.
Some have married spouses they believed they were led to by God, but has found unpleasant.
Some have found themselves in churches they believed they were led to by God, but has found unpleasant.
Some have moved into neighborhoods they believed they were led to by God, but has found unpleasant.
Some have started businesses they believed they were led to by God, but has found unpleasant.
Some have enrolled in programs they believed they were led to by God, but has found unpleasant.
So many have taken steps hitherto believed to be led by God, but has met unpleasantness that is birthing doubt, complaints, murmurs, growling as the Israelites did when the cloud stopped at that unpleasant water.
Instructive to note is that Moses did not move on because of the unpleasantness or/and reactions around him. He stayed because the cloud stayed. He prayed to God and God worked on the unpleasantness.
In as much God is not leading you away from there, stay, pray and see God at work.
Until the cloud moved, Moses did not move. Do not move until God says so. That spot is an important 'bus stop' you need to pass to get to your destination.