Question: what are the three main ingredients in saliva?
Answer: Water: 99.49%
Electrolytes: ... 
Mucus (mucus in saliva mainly consists of mucopolysaccharides and glycoproteins)
Antibacterial compounds (thiocyanate, hydrogen peroxide, and secretory immunoglobulin A)
Epidermal growth factor (EGF)
Various enzymes; most notably: