When feeling a little sick, especially when paired with an insta buddy, give the out of air signal and calmly take the offered octopus.
After you have been sick, give the OK signal and hand back the reg, please remember to give it a little shake to help clean it, it's only fair!
Ok more serious suggestion..
If you know you are on a long dive, take something like the Capri Sun drinks, you can pierce and have a drink during the dive, you can roll the drink packet up so you "force" the liquid in, just remember to take your rubbish back to the surface.
Just remember to time breathing/swallowing!
If you are on a dive boat and have long hair after your last dive of the day, put conditioner (better if it's the leave in type) on your hair to help limit those knots/wild child look from the boat ride home..
If you don't fancy using Pantyhose, a plastic bag will help you get your leg/arm into wetsuits, or a stocking, unless of course you like the feel of the pantyhose....
Pantyliners (don't squirm guys) make a good liner for camera cases, buy the ultra thins + the adhesive backing keeps them away from the seals if you position them right... if needed you can even cut them down, but I find the very thin small ones are great.
Just if you have the pantyhose and the pantyliners on the same boat.... expect odd looks!