Squat toilets are no problem. Squat toilets on a somewhat moving train provide an interesting challenge: hold it or hold on. To flush is to fill the chopped off bottom half of a plastic bottle with water and pour it down the hole.

On the bright side, we somehow lucked out in only having three people on the entire car (six if you count the train attendants) so it didn't get too overused.

Location: The train from Bucharest to Istanbul