Rewarding experience! Making one flavor mixes are my normal. Been going at it for four years. I did go buy a bottle once; was substandard to DIY> One small jug in four years.
Another option involving e-liquid; read forums concerning DIY mixing.
There is a great cost savings in DIY over pre-mixed, with some out of pocket start-up expenses.
Many of us had started using nicotine at an early age. We know first hand the damage from a tobacco addiction. The man before me stated best advice, "better have a heart to heart."