My sister-in-law used a big bottle of sanitizer with a pump dispenser. She used her elbow to pump out the Sanitizer gel and then uses a second squirt to use on her elbow. Of course, this doesn't translate especially well for the outdoors. If you've got a picnic bench available you could do it, but you'd still have the issue of taking it down when you're ready to go home. I'll have to ask her what she does when she's out and about. I know it's complicated but the details my be enlightening.