It sounds as though they may have a mild eye infection. You can safely use a product called Terramycin Ointment in the eyes twice a day. If you do not see any improvement in the eyes in 2 days, you need to make an appointment with your vet to get them on a stronger antibiotic ointment or drop. You can purchase Terramycin at most pet supply stores or online at www.revivalanimal.com.
Please let me know if I can help further in any way.
Red, watery eyes could theorhetically be either an infection or allergies, but it is unusual for dogs or cats to show allergies like this - especially in puppies and kittens because they still have many natural immunities from their mothers. The only way to know with 100% certainty is to either take them to a vet and let them do some testing, or treat the problem as if it WERE an infection. If it improves - then it's definitely an infection - if it does not, then your vet needs to evaluate. Terramycin is very very safe-it is used on newborn kittens and puppies all the time, so don't worry about it harming their eyes. It won't. You just never want to use any type of steroid in the eyes without checking with your vet first, as if there are ulcers, steroids can be damaging to the eye.