I have 2 old drum barrels that I want to cut to make a smoker out of 1 (55gal) and a mini propane BBQ out of the other (10gallon). The 55 gl only had coconut milk in it and has been washed out. The 10gl had some kind of almond oil in it. Do you fill them up with water and then cut? I have an angle grinder but maybe a jigsaw with metal blade would be easier? How do you avoid the water getting onto the blades/cutting tools?