In a medium-size bowl, stir together vinegar, salt, and pepper until dissolved.
Add cucumber, onion, cilantro, chili, and carrot to vinegar dressing. Toss until combined.
Cover and marinate in refrigerator for 3 hours, stirring occasionally.
Cucumber is primarily made up of water. The vegetable provides another great source of extra hydration.
China is currently the world's top producer of cucumbers, producing over 40 million tons of cucumbers each year.