it'll still escape sometimes, but will prob get scared and run back in, if its not used to being outside. The only drawback is you have to clean out he litter tray every couple of days.
You can buy trays that automatically bag up solid waste then wash the crystals. You set the timing for washing say five minutes after cat has left tray.
It counts the number of visits so you can then replace the litter after say 20 visits.
Another good idea is a water fountain so you don't have to keep putting out drinking water