This is not a risk. Even if the guy had HIV, which is highly unlikely in itself, even then if he spit directly into your food, it is not a risk. Saliva is not infections and does not spread the virus.
Furthermore, infection with HIV can only occur inside the body, such as through unprotected anal or vaginal sex and through sharing IV drug needles with infected users.
Also please be patient with waiting for a response. It's a holiday weekend in the United States this weekend and this is a volunteer forum where people answer questions in their spare time. It's most likely going to take a while for people to reply to questions this weekend.
The person was chewing some tobacco also at that time. If that spit contains blood. Is this possible route for hiv infection