When I am going light, I use a "swiss gold" filter
http://www.whittard.co.uk/store/catalogue/Tea-&-Coffee-Equipment-P6000/Infusers-Strainers-&-Measures-SC6006/Swiss-Gold-Filter-115592.raa
These use real coffee but can also be used to make tissanes and also for coarse (actually quite fine) filtering of water prior to boiling etc.
I found them at a fiver each in a whittards sale a while ago and bought four or five - bargain!
Red
What diameter mugs do these fit?
Cheers, Ed.