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I never got very good booms from it... draino has the side effect of heat generation, which reduces the containment strength. Good for killing plants though
You can get a much higher boom from baking powder and vinegar. It takes a while to get the right ratio (well, it did before I knew chemistry

) and get a good timing mechanism so that you can... close it and run... But it's actually more effective than almost anything else you can get your hands on. Except the really dangerous stuff.
The advantage is that it is non toxic. The weak point is still the cap that gives. If you duct tape the cap, you can actually get a pretty impressive effect - the only drawback is that you need a really really good timing system... and this works better for the 2l bottles so that you can get enough pressure to actually blow the bottle up (this is harder than you think... and believe me, when they don't blow, you really don't want to get close.)