This is probably Savage Planet
The synopsis from Wikipedia says it all:
In the year 2068, Earth can no longer sustain human life with its
natural resources depleted beyond repair. Whereas other companies are
seeking to colonize the Moon, Calron sets its aim much higher: the
planet Oxygen whose potential could save billions of lives. However,
since it is 20,000 light-years away, a technology known as DST (or
deep-space teleporting) has to be used to get there. A team, led by
Cain (played by Sean Patrick Flanery), arrives but soon discover that
it is home to a terror in the form of voracious, enormous, prehistoric
bears and the planet itself is in an unstable condition. The team soon
tries to escape from the planet, but are confronted by many ordeals.
By the time the movie is over, the only two left alive is Allison
Carlson (played by Reagan Pasternak) and Cain (played by Sean Patrick
Flanery), who manage to teleport back to Earth.
From the IMDB reviews page:
The plot has something to do with getting air from a planet, but I
couldn't really follow it because the movie has SPACE BEARS. Isn't Sci
Fi supposed to be about delving the depths of your mind to create new
creatures who have never seen the light of day, truly exorcising [sic] your
imagination. And when I think Sci Fi, the first thing that pops into
my mind is SPACE BEARS. For about 3 days after I saw this movie I went
around shouting SPACE BEARS. Yeah, its that bad.
I suspect these are the prehistoric bears mentioned in the question.
There is also a well, not of water, but of green slime that can cure anything:
Anyway, as the number of humans drops to an all time low they suspect
one of them has double-crossed the rest. He discovered a well of green
slime in a cave that cures all disease and even regenerates lost
limbs! The traitor then tries to make it back to Earth to get rich off
this stuff, and leave his buddies behind on the "Savage Planet" to
become bear food.