The first thing you will need to get is a refillable fire extingusher the kind that you can charge with a bike pump. Take a round plastic pen cut both ends off and remove the stuff inside. Now take the hollow plastic tub and shuv it in the end of the hose comeing out the extingusher place a hose clamp around the hose to make it tight. Now fill the extingusher with your paint charge it, this is now your grenade filler. Get some latex surgical tubbing and some plastic ties. Cut lenghts of tub about 4 to 6 inches long, fold one end and clamp it down with the platic tie so that it is sealed shut. Now shuv the other end on to the plastic tub on the extigusher/grenade filler. Open the valve on the Filler and hold the tub it will fill up like a hot dog leave about 2 to 3 inches unfilled on the open end. Once it's filled twist the unfilled end up like a snake coil and rap a bread tie around the coil. Now it's either thrown like a grenade or you can tie a string to the bread tie and make a trip wire mine. These are cheap and people don't steal them.