I would go ahead and try to put it in a pot or in the ground. I don't think it will last long in water. Firm the soil good around it and keep it well watered.

Before you plant it in the ground, be sure you want it there. Pine trees are forest trees and do well in such an environment. If you have a large piece of property to put it on that's fine. Pine trees should not be planted near a home or you will suffer the consequences later. They can and will destroy your sewer system and tend to snap off in high winds. I had two removed last year that were planted by the previous owners. Roots had traveled over 80' to reach the sewer pipe and invade them. It's also very costly to have them removed, at least 600 dollars a tree. Another consideration are the local laws concerning the removing of mature trees with in the city limits. Yes I'm talking about Houma.
"gene"