I asked Giles about this for you today and it will be fine if you leave it for a few hours to air and then put away.
In the unlikely event that anything should go a bit mouldy, (can't think why) the filter will do it's job again anyway when you use it and remove anything nasty. If you want to be extra safe, just flush it through once before using it and the filter will remove anything in there.
I've got 2 on the go at the moment, one my daughter is taking to Mexico with her in a couple of weeks and one Rose is taking on a long distance ride next week. I can't remember which one I used up in Cape Wrath in early May and they have just been sitting on the window sill and desk ever since.
They smell fine and I may give them a swill out, more out of habit than anything else, before they leave. Just remember it removes all bugs, taste and taint, as you will already have found out, so there's very little to worry about.