It's a good question to ask and answer is yes but the bottle should be transparent or translucent and should not be opaque.You can get a soft drink bottle or any bottle in which water is visible from outside to the invigilator but it's generally not required as timely water is provided by a waterboy at your desk only.
Happy JEE.

Dear Saptarshi,

Yes, you can take a water bottle with you.

 

Good Luck!!

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