Most people are dehydrated and changing this alone would solve so many health issues. Fill a bottle up and then you can see how much you’re drinking throughout the day. Drink warm or room temperature water rather than cold water from the fridge.
Get a jug filter if you can, you’ll be surprised at the difference it makes to the taste. Add lime, lemon or herbs if you’re not used to drinking water. Start your day with a glass of warm water, it’s also really good to relieve constipation.