Nice guitar, and good on ya for taking care of it.
If you are looking for an in-case humidifier, I drill a series of holes in the top of a cheap, plastic case made to hold bar soap for traveling--they cost about a buck. I then cut a cellulose sponge to fit. Similar idea to the rubber tube mentioned, but lasts much longer. Just be sure to squeeze out enough water from the sponge so that it doesn't drip.
Overall, though, I don't find in-case humidification works all that well in part because folks forget about it -- it is better than nothing, though. What I usually suggest is that you get a room humidifier to manage humidity in one room of your house. A nice place to do it is in the bedroom, because if your place is on the dry side (esp. common during winter), it will be better for you too. Keep the guitar out of the case (if you can), which might encourage you pick it up more frequently too.
Most builders keep their shop pretty close to 45% RH, which is often quoted as a typical, average indoor RH. Ideally, your instrument wants to be close to the RH at which it was built, so if you're really wanting to be careful, check with Tippin.