+1 to being careful.
Take look through some of the build threads, includeing "bling Bling electric Herms". This will give you a good foundation so we aren't starting from scratch.
Also, if your house is up to code, you will likely have a GFCI protected outlet within cord length of your stove.
It will be really easy to make a "helper heater", one that you do not have to tweak to get the boil just right.
here is a little outline for you:
1) Drill a hole in your kettle
2)pot the connections for the water heater element as in "bling bling electric herms"
3) use a bulkhead fitting from bargainfittings.com to mount the heater to teh kettle
4) run SOOO cord (soft extension cord wire - appropriate guage) to a switch mounted in a project box
5) run from a switch to an appropriately sized wall plug.
Here's what you need:
1500 or 2000 watt element
JB Weld
12/2 (with ground) SOOO Cord (15 feet approximately)
plastic project box
20 amp switch with cover
20 amp rated wall plug
drill with step drill bit
small stainless steel bolt (depending on how you mount the ground wire)
More later... tired now