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Keep your throat moist when singing in whistle register because the strain is greater than when singing in other ranges. Drink lots of water around your performance. Stay away from alcohol and caffeine before performances because both substances dry out your throat. Talking loudly puts more strain on our vocal cords than talking at a normal volume. If you talk loudly, or talk for a long time, you put extra strain on your vocal cords besides the strain of singing. Don't talk for long periods of time the day of your show and definitely don't yell. Any time you are going to sing, you should warm up your mouth, jaw, and vocal cords. Perform a few exercises like singing through your scales and trilling your tongue and lips. Work upward through your notes to reach the whistle register. Never jump straight into notes in the whistle register.
Hydrate before, during, and after performances. Talk quietly before a performance. Warm up before every performance.