'Bitter' in the Bible

Does a fountain send out from the same opening both fresh and bitter water?

But if you have bitter jealousy and selfish ambition in your heart, do not be arrogant and so lie against the truth.

The name of the star is called Wormwood; and a third of the waters became wormwood, and many men died from the waters, because they were made bitter.

So I went to the angel, telling him to give me the little book. And he *said to me, “Take it and eat it; it will make your stomach bitter, but in your mouth it will be sweet as honey.”

I took the little book out of the angel’s hand and ate it, and in my mouth it was sweet as honey; and when I had eaten it, my stomach was made bitter.