TF writes:

Any suggestions on preflight preparations that have worked for others ? No
coffee before the flight ? No liquids xxx hours before leaving etc. etc.
Sort of like preparing for an operations.

Make sure you are well hydrated in advance of the flight, but don't
drink much in the way of fluids in the last 3 hours or so. Avoid
anything with caffeine in it. Avoid alcohol (but you'll be doing that
anyway). Be sure the cabin is comfortably warm while you are flying
and avoid very cold temperatures prior the flight (cold produces
diuresis). If you are thirsty before the flight, you didn't drink
enough in advance. Make sure your thirst is quenched in the hours
before the flight, then avoid much in the way of drinks in the last
three hours or so. Avoid eating more than a snack during the same
period.

Bring something to drink along on the flight. If you get thirsty, you
can sip your drinks. If your flight is three hours, typically by the
time the stuff you drink on board starts to find its way to your
kidneys (if it does--it won't if you truly need the hydration), you'll
be back on the ground.

For emergencies, you might want to bring along urine collection
devices.

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