Mommies... I have a question that's been bothering me. One mom told me…

Mommies... I have a question that's been bothering me. One mom told me to give water to my baby and not listen to the pediatrician (give water from 6 months). What do you think? The child needs water, just a little bit, but the body is dehydrated severely... I tried giving her some, first time she drank it, second time no. My daughter doesn't understand that she needs to suck on the bottle, she chews on it and doesn't drink ??‍♀️ I would like to hear your opinion about this.