Why is my mouth so dry even if I drink water

Sucking and chewing both encourage salivation.
Consider ice pops or ice cubes without sugar.
Gum without sugar or hard candies without sugar that contains xylitol.

Try drymouthpro oral rinse. It helps to increase saliva production.

Soft natural foods like soups, canned fruits, soft cooked/blended veggies like carrots or celery, mashed potatoes, soft-cooked pasta, oats, ice cream, pudding, and popsicles are other examples of soft foods that are beneficial for those with dry mouth.

To increase saliva production, chew sugar-free gum or savor sugar-free hard candies.
Reduce your caffeine intake because it can dry up your mouth.
Alcohol-containing mouthwashes should not be used as they can be drying.
If you chew tobacco or if you smoke, stop immediately.
Drink water frequently. Use DrymouthPro oral rinse, it is the most effective remedy.

Treatments for Dry Mouth at Night
To add moisture to the air at night, use a humidifier.
To stay hydrated, sip lots of water throughout the day.
Use drymouthpro oral rinse. It is a moisturizing mouth mouthwash; stay away from alcohol-containing ones. Eat nothing spicy, acidic, or sweet before going to bed.

On its own, dry mouth is not a major medical condition.
However, it might occasionally be a sign of a different illness that needs medical attention.
Additionally, issues like tooth decay and ulcers in the mouth may result.

Dry mouth may be caused by autoimmune disorders like Sjogren's syndrome or HIV/AIDS, as well as by ailments like diabetes, stroke, oral yeast infection (thrush), Alzheimer's disease, or other health conditions.
Additionally, mouth breathing and snoring can cause dry mouth.
 

Dry mouth is a common symptom of high blood sugar in diabetics.
Sometimes the first obvious sign of diabetes is dry mouth.
Speak with your healthcare physician if you experience dry mouth and suspect you may have diabetes. 

Stress can have a variety of physical effects on your body and raise your risk of acquiring a wide range of diseases, including dry mouth.
Dry mouth can result from stress and anxiety, according to the Journal of Dental Research, Dental Clinics, and Dental Prospects.

Lemon is a well-known natural treatment for dry mouth because of its citric acid concentration and tart flavor.

Drink water: Drinking enough of water can keep you hydrated and ease dry mouth.
According to studies, dehydration may contribute to dry mouth.
Increased water consumption can aid in the treatment of mild dehydration.