When our kids were younger, they were always too scared to go to the washrooms at night because the lights would attract all kinds of bugs. There were a few times when we were either too far away from the washrooms or there just simply wasn't any where we camped so we had to come up with a solution.
Step 1: The Build
I used a 5 gallon bucket, small kitchen garbage bag and a pool noodle. Wrap the noodle around the pail to get the circumference and cut the noodle to length. Cut a slit down the length of the noodle to the centre. Place the garbage bag in the bucket and push the noodle down over the bag and the lip of the bucket to hold it there. I had to cut a few shallow relief cuts in the noodle around the outside so it would bend enough to stay there. It isn't the Hilton, but if you are camping and the young'uns gotta go, this is a convenient way. Just place the bucket behind your tent or wherever so it doesn't get knocked over. I recommend changing the bag every day to control odor and so it does't get too full.