There’s two possibilities here: either you were already getting proper hydration from food (fruit, vegetables, soups, stews etc all have a bunch of water), or you weren’t getting proper hydration from drinking water. The latter could be because you lack electrolytes (you can buy em as a powder and add to your water), or you weren’t spacing out your drinking properly. You can only absorb so much water at once (about 250ml every quarter hour at most). Sipping slowly all day is key, chugging a lot at once isn’t going to benefit you much(unless you’re trying to fight a urinary tract issue like kidney stones or sometimes a UTI).