You need to get a good set up. Those you buy at the gas station are junk. Head to a vape store.. A good one that sells decent equipment and liquids and has good, knowledgeable employees who will spend how ever long it takes to explain everything and give you recommendations.
I walked into one with no intention of quitting smoking when I woke up that day. All the people in there were so helpful and optimistic! They spent almost 2 hours with me. I got my vape set up and have never smoked another cigarette since April 1, 2014 after having smoked a pack and 1/2 for 45 years!
Move on from the crappy disposable e-cigs and get 2 reliable rechargeable vape set ups. While one is recharging, you can use the other. You will be SO happy! You can do it!