Some years back, we had a boil water advisory for almost a week and were glad that we had a 3 gallon SS pot. Even though we had bottled water stored, 4 people in a house can go through a large amount of potable water in a hurry as the tap water was contaminated enough that washing your skin or hair with it was not advisable until the water was boiled. The SS pot was always on the stove and topped up when needed then boiled, usually 2-3x times per day.

As for using a camping stove such as a Coleman propane 2 burner, they are slow (but better then nothing) to bring any significant amount of water to boil and cannot fit that large of a pot on them. It helps with the propane costs if you have an adapter to connect the Coleman stove to a 20 lb or 11 lb propane tank.