Hmmm, depends where in Europe, there are places where its quite cheap/reasonable. I think zippo lighter fluid is expensive, you should rather go to hardware stores look in the solvent section or try to find chem/lab supply shops in the nearest city. Another option is ordering solvents but Im not sure it depends where you are, in the UK I hear there are suppliers. Maybe ordering some solvents can be suspicious depending where you are, but you could alternatively find something like limonene/orange oil, which wont be suspicious to order. Im not sure of a good supplier in europe, one of the shops isnt selling anymore, but Ill try to find out and will let you know
Dont do the water only tek, there has been nobody so far that did it with success to tell others. If I were you I would look better for solvent, or try to find limonene (or if I find I will tell you) and do some tek like BLAB or a dry tek like amorfati/q21, or in the worse case I would try to extract with canola oil or something similar, salting with vinegar or FASW, then converting to freebase with sodium carb.