Sick kitten and stressed cat

Six days ago we adopted a kitten from the local humane society and brought her home. We already had a 2 year old cat. Both cats live in our garage and can go in and out of the garage as they please in the daytime. Yesterday the kitten, who is supposed to be a little over two months old, started to catch a cold. She has runny eyes and stuffy/watery nose. I would bring her in the house where it's warmer but my husband is allergic so that isn't an option. I put a bunch of towels in her bed though to help keep her warm. This morning she sniffed at her food and acted like she wanted to eat but then changed her mind. My older cat isn't sick yet, but I'm worried she may catch it since they are both in the garage. She hasn't been eating very much since the kitten arrived either. I've read about the L-Lysine for cats and I think I will give that a try for both cats. I was thinking of also getting some canned food for them both to encourage them to eat. Is there anything else I can do to help my kitties?

Thank you for adopting this cat.
I'd call the humane society and see if their vet can see the kitty: she may need antibiotics. If the discharge for her nose is green/yellow, she definitely needs to be seen by a vet.
Could you confine her to a spare bathroom?
If she does not eat anything for 24 hours (she probably can't smell her food), then you may need to syringe feed her; kittens especially can go down hill fast if they aren't getting enough food.
Stress can bring on colds, of course. And they are contagious, depending upon the immune system of your other cat.
Meanwhile, yes, l-lysine is a good idea to build the immune system; I'm not sure how effective it is once a cat is sick. 250mg twice daily, which is about 1/8 teaspoon.
Wet food is always a good idea BUT. Your kitty has already undergone some changes, a change of diet may cause diarrhea. So, first I'd try to find out from the humane society what she was being fed and continue feeding her that until she's gotten over her cold. To make the food smellier, heat it up a little; fish is especially smelly.
Good luck, and keep us posted.

Thank you for your help! The discharge from her nose is clear. I would do the spare bathroom idea but unfortunately our house is small and we don't have any spare rooms at all. I will call the vet and see what they have to say. And both of our kitties are rescues, the kitten from the hs and the cat was living on the streets as a kitten and she came to my truck while I was parked in a parking lot so I took her home.

Bless you for caring rescuing that little darling!  Bravo for doing your homework!! yes, L-lysine helps out ( I use the capsules for humans as they are easier to handle). You can also add CoQ-10.  You can ask your vet about using Claritin, too. I also use saline solution (the packets sold for NeilMed SinuRinse are a good value and conveniently premeasured) to keep the sinuses clear AND apply VitE or Neosporin to the nose leather.  I also use slippery elm and marshmallow root tea for the more severe cases - I simmer the shredded herbs for 10 min and dilute half tea/half water or homemade chicken broth.

         You can make chicken broth by adding real salt (sold at feed stores - it's great for people too - it's whole salt that contains calcium, potassium,sulphur,magnesium,iron,phosphorus,iodine,magnesium,copper and zinc.  If you cant find it as RealSalt, ask for mineral salt, sold for horses and rabbits -it's naturally a pinkish color) and baking soda plus some apple cider vinegar.  You can shred the meat for the cats or use it for your own supper. the salt and soda help create a homemade Pedialyte electrolyte replacer and the vinegar supposedly helps draw out the minerals from the bones.  Just DO NOT use garlic or onion as some cats cannot tolerate these.

          Another big plus is to provide a warm nesting spot.   You can line a cardboard box or plastic tub with egg cartons (most pancake houses will gladly give you the large, 30-count size ones) and, if your budge allows, cover it all inside with Reflectix (of if budget doesnt allow it, you can substitute windshield shades or insulated shopping bags from the 99centsONly stores) and then put down the towels. Using the egg cartons to create air space and lining with Reflectix will give your kitty shelter a high R-rating to be envied    If you ask your friends and family, I am sure that you can find someone to hunt down a fleece-lined jacket or flannel shirt to line the nest with - my most recent score was from the dumpster outside the thrift store!   Alternately, you can cut holes in an ice chest.

         If you or your DH think of another cat shelter, please let us know - we feral-caretakers are always looking for new ideas!

        As for me - I am sending prayers that your little one make a speedy recovery and that your big cat stay healthy!!! 

Thank you all so much! I bought some of the L-lysine and I'm giving it to both cats. The older cat still hasn't caught it (fingers crossed) and the little one seems to be getting better day by day. Thanks again!

Another update: Little Waffles is 100% better now! She's out playing and catching bugs and no more sneezing or runny nose. Thanks for everyone's help!