Sine the Philippines seems to have no shortage of either species.... Coat the bottle with peanut butter or cheese.
Too small for a politician, you need a bigger tank! Maybe a different bait too, like a 100 peso bill.
I think you should use "Grease" for Politicians, they would go for that with out hesitation, and I would willingly donate the "Grease" if I could be assured that they can not get out of the "Barrel" by them self...