Warning I am not an electrician. I do not recommend using this list to build anything.
This is just a rough list from memory. I'll refine it as I go.
20 ft of flexible 3/10 cable
5500 watt heater element
wet location switch cover
electrical box for switch
30 amp toggle switch
30 amp electrical plug
30 amp electrical receptical
JB Weld Kwik Stick (not sure if I can use this)
1" PVC coupling
Need to buy
GFCI breaker or something on cord
step drill bit for 1' 3/8" hole
stainless steel nut for holding element in place
high temp gasket for between nut and wall of kettle
NOTE: I am not recommending building this. Electricity is dangerous.