Little John is your friend. My friend, at least, with a place of honor in my flight bag right next to Capt. Jepp’s big brown book. On one long flight he acquired a buddy: after consuming the contents of my water bottle, a second bladder emergency occurred, and there was no choice but to convert said water bottle into a backup collection container. When even that proved inadequate, I found that with very careful handling, those containers could be emptied out the small vent window that Mooney puts on the pilot’s side. Very careful handling.