Just want to put in a good word for a product called the Relief Band.
It is an FDA-approved medical device (proven effective)than can be
purchased online for about $75 and is available in many drug store
chains. It is effective for motion sickness, morning sickness, and most
other nausea. I have found it effective 85% of the time. It is worn
like a watch and gives an adjustable small electric shock to the inside
of the wrist. Get the one that has replaceable button cell batteries
(they last about 40 hours).

So when you must give a ride on a hot bumpy afternoon to a passenger
that just had a big lunch you might have them put on a relief band
before the get in the glider. Barf bag as backup.