When the battle begins, you should only have two weapons, the Zap-O-Matic and Disclocater. Neither of these weapons will work effectively enough to kill both Bongwater and the KGB agents. However at the start of the level, towards the left far wall, there is a large container of Revelade. Around these containers are small barrels. These are explosive barrels. Once the battle begins, quickly use the Jetpack to go towards the left side of the room. Once there, try to take cover behind one of the Revelade containers. While hidden, use your PK ability on one of the explosive barrels. Once you have it levitating, either quickly swing it at the KGB agent's or Bongwater's feet, or press Y again to push it towards them. Either will work, as the explosion is enough to take out almost all the KGB agents. Only about two to three explosive barrels are required to take out Bongwater. Do not get too close to the barrel when it explodes, as it will drain your shields drastically or kill you.

Walk in, but not so far that the KGB and Bongwater notice you. Use your PK ability to slam an explosive barrel directly on top of Bongwater. They will not react to your presence in the room unless you begin to attack them or walk too close to them. This will not kill all the KGB agents, but it will kill Bongwater before cutting away to a scene before the KGB can finish attacking you. Once the intermission sequence is over, you can take out the remaining KGB agents easily.

First, kill the KGB agents with your Zap-O-Matic while trying to avoid Bongwater. When your health is low, jetpack to the ceiling and hide from the enemies so your shield will regenerate. When all the KGB are gone, jump onto one of the Revelade containers. Bongwater will run to the base, but he cannot hit you. Then, zap him to death from your elevated position.