hello srijan,

no,you're not allowed to carry any water bottles or any other liquid items.but there'll be distribution of water in certain periodic time to every candidate who are taking exam.please refer the following link to know the guidelines for the exam day and to know what have to carry on exam day,

• https://engineering.careers360.com/articles/jee-main-exam-day-guidelines
  
• https://engineering.careers360.com/articles/jee-main-what-you-should-carry-exam-hall
  

please copy above links and paste it in the url of your browser.

all the best!

I Hope this information will be useful to you.

if you need additional information,let us know to help you.

Thank you!!!:)