go with finasol
When androsol was on the market, it was just andro and 99% alcohol. They did their own article over at test on how to turn it into finasol, basically you just add a whole cartridge of pellets, well ground up, let it sit for at least a week, then put it through a coffee filter so the sprayer doesn't clog. So that is when everyone just started buying the 99% alcohol and doing it themselves, basically a tren cartridge in 8 ounces of 99% alcohol. It has to be the 99% percent stuff. The lesser percentages and you don't get good transdermal transfer.
You will have to figure out yourself how to guage the number of sprays with whatever spray bottle you find. But basically a bottle, containing 1 cartridge, should last you a week to 10 days spraying twice a day.
DMSO is aweful I wouldn't go that route, you are prone to get rashes, sores even, plus you can pull infections in through the area you apply it... The spray method is very cool.