The red heifer represents an earthly female with the same attributes as Yeshua Messiah who is purified to the point that she becomes just like Him so that she can become His Bride.
The water drying up after Miriam dies describes a lack of praise and worship.
The serpents bites are punishment for rebellion, but looking at our rebellion in the face (looking at the serpent on the pole) heals us.
The Red Heifer is the most profound and ongoing prophecy in scripture. Yes, she pertains to Yeshua but there is much more to this heifer! She teaches about fire and water, the end of days and our coming fire baptism. She teaches us about the importance of purification and what that means for those going into the Great Tribulation.