The first time I ever used a squat style toilet I was in Bahrain. A horrible situation as I ran into a Bahraini military command post asking for a bathroom or a W.C. (water closet). I ran into a little room that looked kind of like this, and dropped a turd, then realized that they didn't have toilet paper. Instead they had a water hose type of set up. I just shredded my t-shirt and wiped with it.
This is the most common toilet I used overseas. Just an outhouse style shitter slapped together by Civil Engineers or SeaBees. The seat is wood, so splinters in your ass cheeks wouldn't be a surprise. Underneath the hole is an oil drum cut in half with some water in it. No real chemicals, just a lot of urine and feces wreaking hell on your nostrils in the heat.
Oh yes, the Harvest Falcon toilet of the wonderful bare base. When I first used these wonders in Oman we didn't have the curtains in front of the stall, we sat about waist high in the air to everybody walking by while we took a dump. You really learn to lose your inhibitions in that situation. The metal trough in the middle of the picture is the handy-dandy urinal.
This is a piss pipe. I only had to use one of these a handful of times, usually at a POL site. I can't believe somebody actually had a picture of this on the web. Pretty self explanatory. You PISS in the PIPE. Top notch.
The water bottle, this is your best friend on a convoy, because you're not allowed to pull over if you need to take a leak.
The MRE bag was a great toilet in a jam. It's water proof plastic material could catch a turd without spilling all over (as long as you kept control).