Take a look at the water tray. I knew the new ones came with a magnet and spot for it (at least on the replacement ones sold for the T7), but didn't realize it was marked where the water fill line was at first.
If I wasn't the only one using it, I would use a paint stick to highlight that for future users.
That said, I tend to fill from a plastic Folgers jug, and when done I empty it into another one. I thought about trying to run the water over a coffee filter to see if I could grab the gunk and save the water, but realized the time verses the cost of the filters, etc. didn't make that worth it to me.
If I wasn't the only one using it, I would use a paint stick to highlight that for future users.
That said, I tend to fill from a plastic Folgers jug, and when done I empty it into another one. I thought about trying to run the water over a coffee filter to see if I could grab the gunk and save the water, but realized the time verses the cost of the filters, etc. didn't make that worth it to me.