Mommy Tommy is still the hydration champ even when he’s not drinking water! User mra5062, in the Where The Dudes At? subreddit, 23 Jul 2018
TIL Coffee does not dehydrate you and likely hydrates instead User BeanTownBopper, in the Today I Learned (TIL) subreddit, 23 Jul 2018
Water Champs can drink their cafe in peace! User tyler0887, in the Where The Dudes At? subreddit, 12 Jul 2017
No Evidence of Dehydration with Moderate Daily Coffee Intake: A Counterbalanced Cross-Over Study in a Free-Living Population User TheSlowestCheetah, in the Coffee subreddit, 17 Nov 2015
PLOS ONE: No Evidence of Dehydration with Moderate Daily Coffee Intake: A Counterbalanced Cross-Over Study in a Free-Living Population User NSLbot, in the NSL subreddit, 14 Jan 2014
There is no evidence that coffee dehydrates you, according to this trial in human subjects User mark_lynas, in the Reddit Science subreddit, 10 Jan 2014