Answer:
The healthiest drink is plain water.

Explanation:
Water is an essential component for maintaining good health. It is the most natural and healthy drink that is easily available to us. Here are the reasons why plain water is considered the healthiest drink:

1. Hydration:
Water is vital for maintaining proper hydration in our bodies. It helps in regulating body temperature, transporting nutrients, and eliminating waste products. Drinking enough water throughout the day is necessary for optimal bodily functions.

2. Calorie-free:
Plain water contains zero calories, making it an excellent choice for people who are trying to manage their weight. Unlike sugary drinks or sodas, water does not contribute to weight gain and does not contain any harmful additives.

3. Essential for bodily functions:
Water is essential for various bodily functions such as digestion, absorption of nutrients, circulation, and lubrication of joints. It helps in the proper functioning of organs, including the heart, kidneys, and liver.

4. Promotes healthy skin:
Drinking an adequate amount of water keeps the skin hydrated, which can improve its appearance and elasticity. It helps in maintaining a healthy complexion and prevents dryness and wrinkles.

5. Natural detoxifier:
Water plays a crucial role in flushing out toxins and waste products from the body through urine and sweat. It helps in maintaining kidney function and prevents the formation of kidney stones.

6. Cost-effective and easily accessible:
Water is readily available and affordable. It is a cost-effective and accessible drink for people of all ages, regardless of their location or financial status.

In conclusion, plain water is the healthiest drink as it provides essential hydration, has zero calories, aids in bodily functions, promotes healthy skin, acts as a natural detoxifier, and is easily accessible. It is important to prioritize drinking enough water daily to maintain good health.