Diy is a good way to produce juice in your home. You save money and get to tailor the mix to your own liking. There are ecig juice mix forums all over the internet.
After mixing up every juice recipe I thought that I would like, I ended up
vaping mostly unflavored juice. You can always add a few drops of flavor in an unflavored mix. It's a great (and cheap) way to find your favorite mix. Mix recipes can be found all over the internet juice mix forums.
I keep a bottle of PG and a bottle of VG around all the time to mix up unflavored and flavored juice. The most economical method is to mix tiny samples of mixes using the drop count method. Mix up a recipe that fills a tank and try it. If you don't like it there's no big loss if you dump it and try again.