Analytical Survival brings forth another excellent video discussing alternative fuel sources. He covers topics such as gasoline storage, electricity, and heating methods.
A good point he makes is building preps for alternative fuel sources over time. This can get expensive especially if purchasing generators. I recommend concentrating early on with cooking and vehicle fuel sources. A good Coleman camp stove with extra fuel canister is a portable means for cooking. If you have a gas grill at home pick up several extra propane tanks. Purchase several 5-gallon metal gas cans and set up a rotation system.
Here’s the video: