Here's how I DIY,
@Caesar77. I'm not sure what suppliers are available to you in Spain.
View attachment 757661
Flavoring: currently using Stixx Mixx NET, which you can buy from Nicotine River or direct from SM. Originally, I bought Hangsen and Inawera from Bull City Flavors and Nicotine River. Starting out, I wouldn't buy a larger size than 10ml, until you're sure it's a keeper, then I reordered 30m. Most cost around $3 per 10ml.
Nic, VG: I've bought these from Wizard Labs & Nicotine River. I use 48mg strength nic. You can save money by getting 60 or 100mg, but I thought it'd be safer in the event I made a mistake to use a weaker one. You can get PG or VG based nic, depending on the final mix you want. I buy 250ml bottle of Nic ($12) for every 500 ml bottle of VG ($4).
Syringes: You can get them anywhere. I think I got mine on my first diy order from Wizard Labs, but you can get at FastTech, or maybe even your local drugstore. I'd recommend a 3 ml, and a 5 ml. They're super cheap, so you can get extras if you want, but I never used more than one of each. You can get 3 of each size for about $1-$2.
Bottles: I'd get 10ml plastic bottles - maybe 10-12. You'll want to try new flavors in these, and don't want to make more than 10ml in case you don't like it. 30ml chubby gorilla style plastic bottles. You can use any type of bottle you want, of course, but these are easy to fill, shake, and use. And you can write on them with a sharpie- flavor, date, strength- and wipe off the writing when you empty & refill. A 5-pack of 30 ml on Fasttech costs $2.31, and a 5 pack of 10 ml costs $1.81.
You'll need a calculator to start. I use this one
View attachment 757653
Plug in what you want- this is a 30ml batch:
View attachment 757655
And it tells what you need:
View attachment 757659
So to make it easy, I put water in the syringe, measure to 8.75 ml, and put it in the bottle. Mark the line, and dump the water. Then just pour the nic in the bottle to the line. No need to measure again - just mark your other bottles the same height, if you want same nic strength.
I've tested my flavorings by dripping into the syringe, and found that there's about 50 drops per ml. So after putting nic to the line, I just put in about 100 drops of flavor. Then fill almost to the top with VG.
Shake, and done. Mark the bottle with your date, etc. shake every couple of days. And I've found you don't
have to wait for steeping. Some brands are better after a week, some better after a month, but you'll be able to test each one every few days until you learn. Some tobaccos are actually better the first day or week than after a month.
So all in, to get started costs about $25 to get started. And if you figure 250ml + 500ml= 750ml, divide by 30, and you get about 25 bottles of juice for $16. That's $0.64 per bottle. If you figure a 30ml bottle of flavor at $10 makes about 15 bottles of 30ml juice, that'll add $0.67 to each bottle. So every 30ml bottle costs you $1.31 total. It's
much better than what you buy, and you know what's in it.
Hope this helps, and good luck.