What kind of bag are you using? And why do you feel like you have to change it every day?
I had my colostomy almost 4 weeks ago and I change them every 4-5 days (I know I should be doing it every 3-4 days), but I found out that in the 2-piece bag, the wafer and already made wax ring 7805, if you take the time to cut the wafer close to your stoma and allow the ring to show a bit (1-2 mm) around the wafer after you apply the wafer on your belly, it holds and seals the bag wafer good. The fabric on the wafer that comes with Hollister bag 18133 is great.
One more thing, when it is time to change, I take a good shower and clean my skin well, then let it dry for 2-5 hours. I am careful and use paper towels to collect any mess coming out of my stoma.
For irritation, I use a bit of honey and leave it in place for a while during these 2-3 hours with nothing on my belly. (Clean the honey with a warm cloth, let it dry, and then apply the wafer.)
I hope this helps.