This can be difficult you do not look around first. At this point you should only have two weapons, the Zap-o-matic and the Disclocater. Unfortunately, neither of these weapons will work effectively enough to kill both Bongwater and the KGB agents. However at the very start of the level, towards the left far wall, you will see a large container of Revelade. Around these containers are small barrels. These are explosive barrels. Just as the level starts, quickly jetpack over 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 Triangle 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.