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I don't like eathing other foods who touched their saliva on it.
I don't like eating other's leftover foods.
He ate half banana biting it and the other half is left. I don't want to eat the other half becuase his saliva must be there.

Could you please correct my sentences? Also suggest me better versions. Basically, I'm looking for a word to mean someone saliva is there after eating the half of it.
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You don't have to mention such unappetizing things; the listener gets the point. Use these:

I don't like eating food that others have touched.

I don't like eating others' leftovers.
He ate half the banana, so I don't want to eat the other half.
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These are also acceptable:

"I don't want to drink from/out of his/your/someone else's glass."
"I don't want to eat something that someone else has bitten."
"If you'd like me to share the banana, let's cut it in half first."
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Comments  
Thank you Mister Micawber.
But I'm looking for a word to mean that which might be needed for the likes of following contexts :

(1) The glass of milk is ................ Do you still want to drink it?
(2) The waiter is so dirty that he first ............... and then serves the ice creams to patrons.
(3) I don't want to drink the water as you have ............ it.
(4) Please don't drink the water using your lips. Drink it without touching your lips.
I repeat that the language you are looking for is unacceptable in open conversation. Use these:

(1) The milk glass is dirty/used. Do you still want to drink from it?
(2) The waiter is so dirty when he serves ice cream to patrons.
(3) I don't want to drink the water as you have touched it.
(4) Please don't touch the fountain when you drink the water.
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 khoff's reply was promoted to an answer.