There are at least three machetes in the trunk of the Impala, as well as several smaller knives. Both boys also carry pocketknives. Dean sharpens his pocketknife using a whetstone.
In the episode Faith, we see the boys using tasers to stop the creature. The taser fires small dart-like electrodes that are attached to the gun with wires. An electric current is then sent down the wires. Like all electricity, the charge from the taser is easily conducted in water, which is what damaged Dean's heart.
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