I have a portable urinal from ebay(great for one pee only) so I the funnel in a 5 ltr lenor fabric conditioner bottle.(fits perfect) Just take hidden in a bag to the toilet in the morning and pour away, no leaks/spillage. Then just spritz with a bit zoflora spray. One pee urinal
When we camp with the kids we have a small bucket with clip on lid from B&Ms as we need to empty their potties in it anyway. The bucket is small enough to fit in a bag so not too noticeable.