BITTER>strong and sharp in taste: having a sharp strong unpleasant taste,
 Here we are continue to read in the 8th chapter of the Book of Revelation about the 7 Trumpet Judgements.

As the third angel sounded the third trumpet a  great star fell from Heaven, burning like a torch and it fell on 1/3 of the rivers and streams , this star being called wormwood appeared to make the waters bitter and  1/3 of all the rivers and streams  were so severely damaged( that many men were killed .) It appears the rivers and streams were poisened and when the people drank or swam in them they were killed .

 So now from our last verse , we have this situation , 1/3 of all the sea is destroyed and now 1/3 of all the rivers and streams . That would be a large amount of the worlds water supply destroyed in two trumpet judgements . People will thirst as never before .

 Remember always >

John 3:16 

16 For God so loved the world that He gave

His only begotten Son, that whoever

believes in Him should not perish but have

 everlasting life.