Cat has one watery eye but no other symptoms
I noticed today that my cat, a 4 year old tabby, has one eye that seems to be watering excessively. The discharge is clear and just looks like tears, but it seems to harden into a dark brownish crust. He always has gotten a bit of "eye gunk" that I wipe off periodically, and so has every other cat I've owned, but this is more than usual. It doesn't seem to be bothering him, and he is eating and playing normally, and not paying any special attention to the eye or squinting it or anything. His other eye seems slightly more wet than usual but it's not running out of his eye. Being paranoid I worried he might be sick and so I felt his ears and nose for signs of a fever. His ears felt slightly warm but it's hard to tell if they are warmer than usual or if I am just noticing it more. He is an indoor cat and lives with no other animals. He is acting normally, but normal behavior also includes loud, persistent meowing whenever he wants attention, so it's hard to tell if he might be meowing because he doesn't feel well.
I am in a very bad financial situation and can't afford to go to the vet unless he might really be sick. Of course if he is sick, I will take him, but I'd rather avoid it if it's not necessary because I am having a hard time just making rent right now.