Saliva or Spit? It's all the same

The day we discussed the short story we read, The Surivors of the F227, was the grossest day. Our teacher Mr. Salituro told one of our classmates to spit into a spoon. So gross. We were talking about the difference between saliva and spit and if we were dying would we drink that spoon of spit to survive. All of us were getting grossed out by the spit that we did not really care we just did not want to look at that spoon of spit anymore. We don't think about drinking others people spit when we share drinks, or share food, or have a kiss on the lips with a loved one. We just don't think about drinking one another's spit. But, when we see the spoon of spit we think differently, we just would not drink it. The way it looks it is just so gross, when we are sharing each other's drinks we do not look at the saliva around it we just drink the drink. Mr. Salituro, was explaining how everything is the same we are still drinking each other's spit even though we do not think about it and see it. It is just natural to us not to say, "Oh, I'm drinking your spit." However, when we see a spoon full of spit we just grossed out.