cutie is a barn cat and has watery eyes that are now stuck closed

That is as a result of a severe eye infection, you need to bring him to the vet urgently, they will clean and open the eyes and then they will prescribe an eye ointment to treat this infection. Failing to do so will cause permanent blindness to your cat.

The ointment you got from Amazon won't be prescription strength, which is why it isn't helping. You need to take him into the vet to get prescription eye medication. It is bothering him if he's rubbing it a lot and is light sensitive. Please bring him into a vet today. Best of luck.

It is concerning but not serious since it does not bother him and he holds the open. It may be a allergy or a reaction if he got something in it to irritate it. Cats are prone to viral infections that can cause conjunctivitis, so I would worry that is starting to shows signs from this. I would have your vet check the eye to make sure, but it does not have to be as an emergency. Until then, make sure to keep the eye clean

This is probably an upper respiratory infection. it's very common in young cats and is very contagious to other cats as well. It is treated with antibiotic eye drops/ointment and oral antibiotics for about 2 weeks. if left untreated many cats will end up blind or even die from the disease. It seems your vet already started the treatment which should be completed, if the condition does not improve you will need to take him back to the vet.