Pinky Magar and Kamala Devi scored for India in the 8th and 36th minute respectively. For Bahrain, Reem Yusuf halved the margin in the 42nd minute at the National Football Stadium.
In took just eight minutes for the SAFF Cup champions to unlock their rival's rearguard, striker Pinky Magar stabbing home from a rebound off Sasmita Malik's effort that hit the horizontal.
India doubled their lead in the 36th minute. Kamala Devi doing the needful this time from close after Malik once again crossed perfectly into the danger area from the left.
India had launched an offensive from the first whistle with repeated forays on to the hosts' goal. The duo of Pinky and Bala Devi combined well up front.
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Malik had a game to remember. Not only did her pin-point floaters lead to the two goals, the darting runs down the left flank gave the Bahrain defence a harrowing time.
In the middle of the park, former India captain Bembem Devi was a class apart. The most experienced player for India engineered virtually every move with her ability to shimmy though thickets coming to the fore on most occasions.
India play Bahrain again on Thursday.