Life On social media, people are drinking a gallon a day. How much water do you really need? November 23, 2021June 23, 2022 Dr. Michael Daignault Comments Off on On social media, people are drinking a gallon a day. How much water do you really need? TikTok and social media abound with trends surrounding adequate hydration and hacks on how to achieve it. How much water do you actually need per day?