YOU NEED TO GET A PLASTIC TUB/BIN OF SOME SORT TO CATCH THE WATER. i HAVE ONE THAT IS ABOUT (oops on caps!) 12lx9wx10de - just make sure the bin holds more water than the container you are using for a dripper and that you can easily lift it out to empty (daily). I have some old, but clean, towels that I bunch up around the bottom for any additional spray.
Don;t count on dripping only for water. You should be misting the foliage a few times a day to keep the humidity up and if you live in an especially dry area (northern region/PNW/Canada/New England) you may want to consider a humidifier. go here to see a few setup shots
Luna's old setup
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Chameleon Help & Resource Info
1.0 Nosy Be Panther Chameleon - Cyrus
0.1 Veiled Chameleon - Luna. She's now hanging from her big jungle gym in the sky
1.0 Beardie - Darwin
1.1.1 Side-blotched lizards - Ana and Stan
0.2 felines - Kyndra and Lita
0.1 African Clawed Frog - Skippy
0.1 Chilean Rose Hair Tarantula - Rosa Leigh, Died 4/21/06 
0.1 Goliath Bird-Eater Tarantula - Natasha, donated to science 4/4/06
?.? Pinktoe Tarantula - no name yet