I'm confused about the 3 hour test

Jordan • 29, Cosmetologist. Married. Isaac Wayne born 9/28 7lbs 2oz - 19 1/4inches long! 😍❤️😍
At the one hour I could drink water and even eat breakfast! The three hour recommends drinking and eating nothing after 12. I'm sorry but I live in Texas where it's currently triple digits, I refuse to dehydrate myself and not drink any water. Do yall really think it's going to affect my score?