Does anyone know that commercial?

There was a commercial that I thought was hilarious. I saw it aired in
So Cal. It was something like..."Have you ever had a missed
opportunity?"

There were two friends and it was like 1970 and they were in the
mountains. One friend drinks some stream water and turns to his friend
and says, "This water is soooo good. We should bottle it and sell it."
The other friend says, "Water's free man."

Something like that. Anyone know what it was advertising or where I
can see it?