We know that drinking water is important to our health.  Staying hydrated can help boost our mood, support weight lose, and sharpen our mind. Water is critical for our digestive system, heart, lungs, and brain to function properly.  In fact, every cell in our body requires water.

Recommendations on how much water to drink various from 6 to 12 cups (8oz) per day. How much your body needs depends on many factors including your gender, environment, activity level, or if you are pregnant, nursing, or ill.

No matter how much water your body needs, it is important to drink throughout the day and not try to consume it all at once.  Here are the best times of the day to go for a glass of water:

When you wake up:

When you first wake up reach for one or two glasses of water before you have your coffee.  You will wake up dehydrated after going hours without a drink.  Drinking water right away will help top up your hydration and get your day started on a healthier note.

Before a meal:

Having a glass of water before a meal can help regulate the amount of food you eat.  It will help you feel fuller and therefore you are less likely to overeat.

After a meal:

Drinking water after a meal will aid in digestion especially if the meal contained high-fibre foods.    As fibre move through your digestive system it collects water to keep things moving.  Help it along by giving your body a bit of extra water while the food is digesting.

Midafternoon:

Most people experience the midafternoon slump.  Some people will turn to coffee, grab a coke, or have a sugary treat.  Instead have a glass of water.  The midday slump is often due to dehydration and the best way to deal with that is to have a glass of water.  Dehydration can also lead to anger, hostility, confusion, and depression.  If you tend to have any of these feeling in the afternoon it might be due to dehydration so grab a glass of water and see if that helps get you back on track.

When you have a headache:

Headaches can be a symptom of dehydration.  It can also cause a migraine.  If you feel a headache coming on drink a glass of water.

Before, during, and after exercise:

Keeping yourself hydrated is key to nailing your exercise routine as well as recovery.

Before bedtime:

Have a sip or two before bedtime however drinking too much could result in waking up in the middle of the night to pee. Keep a cup of water beside your bed in case you wake up thirsty.

https://www.everydayhealth.com/healthy-living/8-best-times-drink-water/