Tf,

No
coffee before the flight ?

That helps a lot for me.

No liquids xxx hours before leaving etc. etc.

That has the inherent danger of dehydration. I drink even during the
flight. Absolutely necessary for my well-being.

If your wife is the only passenger, "travel toilets" like this one
http://www.aeromedix.com/?_siteid=ae...f491e9dabbda14
25d83afbb&action=cat&catid=tj make sense.

--
Thomas Borchert (EDDH)