Kenya's National Disaster Operation Centre said in a statement that 80 people had been killed in four districts, updating earlier tolls as the number of victims continues to climb.
Hospital sources said dozens more were receiving treatment.
Some woke up blind after sleeping off the drink, local media reported, while others lost their sight more slowly. Some victims complained of acute stomach pain, blurred vision and general weakness.
He told local media that if he survived he would give up drink for good.
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"What we are trying to establish is the origin of this brew," police spokeswoman Zipporah Mboroki said.
It is not clear if a single brew is responsible for all the deaths, but victims have come from towns both close to the capital Nairobi as well as in the centre and east of the country.
Deaths from toxic alcohol are relatively common in Kenya, with similar cases making the headlines every year.
Locally-distilled alcohol, usually made from fermented maize or sorghum, is popular among the poor, as it is a fraction of the price of commercial and legally made brews.
Some of the latest victims paid as little as 30 US cents for the shot that landed them in hospital, according to local media.
Some unscrupulous manufacturers add methanol to the concoction - a chemical used for the manufacture of anti-freeze - in order to increase its alcohol content.
John Mututho, chief of Kenya's National Authority for Campaign Against Alcohol and Drug Abuse, said his agency was working with police to find the manufacturers and distribution network of the toxic brew.
"Action must be taken and people must take responsibility, police are not doing their job," he said.