“Despite its poisonous nature, methylated spirit is sometimes drunk, alone, or mixed with other substances, by alcoholics who have become destitute. As such, there is an argument that the methanol or other poisonous component should be removed because it can cause death and blindness. It is also common to add a vomiting (emetic) agent, which serves a similar purpose without the fatal side-effects. Likewise, denatonium adds a bitter taste but is non-fatal.

It is not the methanol itself that is toxic, but the accumulation of its metabolites, formaldehyde and formic acid. Because the metabolic pathways for ethanol and methanol share a common enzyme, alcohol dehydrogenase, ethanol can be used to treat methanol poisoning by blocking the enzyme until the body can excrete enough methanol through the lungs and skin. (In a documented case, a shipworker poisoned while cleaning out a methanol tank was successfully treated with administration of a good portion of the liquor in the ship’s “medicine chest.)”
http://en.wikipedia.org/wiki/Methylated_spirits

There must be high class kassipu which hopefully doesn’t have this.

You can try and make some sort of fermented drink, with a mixture of fruit juice and yeast. I don’t think it would be potent though. I have tried it with apple juice after learning the equation for fermentation to produce ethanol when I was in school.