The best replacement for spit is swallow.

The best alternatives to spit are rated as following:
★★★★★  swallow
★★★★  spat
★★★  109
★★  lube
★★  shallow
★  sweat
★  spam
★  vjti
★  vesit
★  camron
★  skewer
★  dj sanghvi
★  phlegm sputum
★  sputum
★  cam ron
★  swallow phlegm
★  phlegm
★  saliva
  spce
  not to spit
  swallow poll
  swallow saliva

Your alternative for spit is not listed? Suggest!
Speaking about spit, one probably shouldn't forget about camel snus.

Other search terms related to spit and their ratings are:
★★★★★ camel snus
You have in mind a companion for spit and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of spit in all years. Click on graph for more.
spit
swallow
spat