… and not a drop to drink
Scientists find the first instance of water vapor on an extrasolar planet. Great news! it’s not exactly one of the elements of the Drake Equation, but it’s good nonetheless.
Here’s the Drake Equation:
and you can find the full explanation for it here.
Incidentally, the N sub E is the average number of planets that can potentially support life per star that has planets. As we understand carbon-based life, water is a pretty important step to fulfill this requirement, so the presence is a good indicator. You could just possibly have silicon based life, but using other elements (iron, oxygen, etc) to base your critters on gets very difficult very quickly. Carbon and water are your best bets by a huge margin, so finding water (carbon is common) is great news.