You eat or drink normal food. On a cross pacific flight you'll have a bunch of stuff crammed into the cockpit with you. Usually a sandwich or two, water, juice, whatever.

No diapers. Life depends on a little space age invention called the "piddle pack". A plastic bag that has either a compressed sponge or a powder that congeals into a gel when mixed with liquid.

The actual transfer of liquid from the human body to the piddle pack is a very detailed and personal procedure that varies from pilot to pilot. Suffice to say there is more than one funny story about that process.

There is no accepted or approved procedure for gastro intestinal issues. Fortuneately it's a very rare occurence. But there are some poor souls who've had to go way above and beyond the call in a tiny little cockpit far frome the comforts of home. Again, these are great stories, but you won't hear one from me here.