When choosing a tennis water bottle, consider the following features:n1. Insulation: Look for bottles with double-wall insulation to keep your drinks cold for extended periods.n2. Leak-proof design: Ensure that the bottle has a secure and tight-fitting lid to prevent any leaks or spills.n3. Capacity: Select a bottle with an appropriate capacity based on your hydration needs.n4. Easy to carry: Look for bottles with convenient carrying handles or straps for easy transport on and off the court.