I wouldn’t dare defile Douglas Adam’s memory by not mentioning that you should keep a towel with you at all times, but my second contender is a surprisingly short three-parter:
- never lie.
- never tell the whole truth.
- never pass up a chance to use a real bathroom.
A wise teacher told me to carry a bottle of water, always.
Nobody will stop you from taking a sip, which is really an excuse to pause.