yes 25% hcl is 75% water, but the highest concentration you can get is 37%, which has a shitload of water also. It's easy to make it a bad with some NaOHI say START with water, add a polar solvent (diethyl ether is top choicefor cocaine and probably novacaine as wellwater, diethyl ether cocaine/procaine hcl and sodium hydroxide, when yo base it, it should move out of the water and into the polar solvent, And now you have cocaine/procaine base in diethyl ether with irtually no water. Chloroform is a fair choice as well, It's easy to make at home, requires no special tools. Engine starting fluid is the source of my diethyl ether and heptane. Chloroform will absorb a little water though, I'm thinking 8g/100g, but it can be frozen and filtered out.
I usuallly don't even comment on synthesis, extraction or using adulterants. Contaminating drugs is contrary to ourn values here