On my audiologists advice I leave my T1s in an airtight jar containing a few silica gel packs every night. He and I discussed the need to get a more expensive solution (e.g. a dedicated hearing aid drying unit), but agreed the airtight jar and silica apoproach was all you needed to do. I leave the silica gel packs on the radiator once per week to remove any moisture, then re-use them again. Simple, cost efficient and, most importantly, effective.
Based on the discussions with him and other stuff I've read about it, it's pretty crucial to regularly remove any moisture from in-ear monitors, regardless of the specific method used. I probably go over the top a little, but I've got the confidence I can use my T1s for marathon listening sessions without fear they're going to break down due to moisture accumulation, which is apparently one of the biggest reasons in-ear monitors break prematurely.