Question 1

do you mix it with water?

Accepted Answer

You can, but you have to shake it really well.  It doesn't mix well with water however. It depends on the type of salicylic acid you purchase.  They do sell differbt tyoes such as crystal salicylic 
and powder form.  The crystals mix better with water.  I would personally add it to a water based lotion or ointment and also mixing ingredients depend on  what part of the body you are using it on.  
For my eyelid, I mix with an ointment,  foe face I mix usually with just an oil,  such as coconut or olive or some higher end oils.

One other ingredient I use is silver drops, which mixed with salicylic acid works almost before my eyes and feels really good , almost like I can feel the healing working immediately. 
I am VERY much a make it myself kind of person , after graduating my 1st cosmetology school in 1988 and even more so since attending others,  and of course trial and error.  
I keep on hand ointments, lotions and make lots of potions that sell behind the pharmacy counter,  it's a great way to stay away from those ugly additives. If you want to search "lotions and potions", on Google,  there is an article published years ago by a doctor with some amazing recipes for things that include what your asking.   The title of the paper is "lotions and potions ", and I'd inhad access to my document file i would attach it, I just don't have the time right now.  If your interested,  maybe you can submit a question about lotions and potions here , and I will make sure input the link in the next response .  It's a GREAT reference to have, and only a few pages

Question 2

Says 0.2to 2%. Is this by weight?  How much powder to mix with how much water to achieve a certain percentage?

Accepted Answer

Yes

ASIN	B0B21DP6NQ
Best Sellers Rank	#14,965 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #10 in Chemical Acids
Brand	MYOC
Brand Name	MYOC
Container Type	Bottle
Customer Reviews	4.6 out of 5 stars 494 Reviews
Item Form	Powder
Item Volume	120 ml
Item Weight	120 g
Manufacturer	MYOC
Model Number	pack of 1
Package Information	Bottle
Part Number	Myoc_SalicylicAcid_$P_Jp
Unit Count	4.23 Ounce
Volume	120 ml

Salicylic Acid Powder (120 g / 4.23 oz) - Cosmetic Grade Beta-Hydroxy Ingredient for DIY Skincare Formulations

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