I have 3-4 urines a day in back of van. Just use boab. Only ever used boab a handful of times to clean windows but it's become handy for urination.
i hope your joking?if not thats ridiculous!just use a designated large plastic drinks bottle and clean it out every week with miltons fluid(or neat bleach)........
Its very very rare i buy a bottle with a big enough top to be useable.
Being a delivery driver previoulsy urination was a key issue. Ive tried using normal drinks bottles in the past, such as coke etc but because the opening is so small an average thingy will not fit. So what happens is you have to push the end of your member to the bottle and urine....youll think it fine, but what happens is pressure builds up in the bottle and when you release you get an almighty blowback of urine all over your trousers. Been there done that.
So a BOAB had been the mpst cnvenient for me, like i said i cant remember the last time i use it and i do bleach it periodically. its easy to use and easy to slosh out after.