How to get your cat to drink water on its own:
1. Ensure the water is clean and fresh. The most important thing for a cat's drinking water is to ensure it is clean and fresh. Regardless of the container used, it should be washed daily, and the water should be changed frequently.
2. Soup. Actually, cats might prefer meat broth to plain water. The broth should be rich and flavorful. Those of you who are good at cooking can make your own meat broth for your cats.
3. Use multiple water bowls and place them in different locations. Cats are not only particular about hygiene, but also picky about their water bowls. Some cats are particular about the material, color, and depth of the water bowl. You can use ceramic, glass, plastic, and water bowls of different styles to cater to your cat's preferences and encourage them to drink more water.
4. You can feed your cat wet food to supplement some of the water it needs. 
The effects of dehydration on cats:
1. When cats drink less water, they are more prone to getting dehydrated, constipated, and even heatstroke in hot weather.
2. If cats don't drink water for a long time, many solids from the cat food they eat will not be excreted with urine, eventually forming stones.
3. Cats that don't like to drink water can also become dehydrated, which can cause symptoms such as lethargy, rapid heartbeat, and sunken eyes.
