Brita MicroDisc Waterfilter Cartridge, 1 Count (Pack of 3), White Attachments:

This style of filter is the only one that fits my favorite water bottle. I just learned the bottle has been discontinued so I really hope these filters continue to be made. The Brita Fill and Go water bottle is the only filtered water bottle that I have found that works for me because other filter bottles don’t allow for enough water to come through to allow me to take all my medication. If these go away I don’t know what I will do.