The name of the star is Wormwood. A third of the waters turned bitter, and many people died from the waters that had become bitter.
Did it fall into the reservoir?
HaHa. Of course this happens during the third trumpet of God's wrath, which happens AFTER Jesus returns in the clouds to gather his elect (Rev 14:14). And no one will miss His return. "Behold he commeth with clouds, and EVERY EYE shall see him..." (Rev 1:7a).