Here is what wikipedia has to say on DDT toxicity.
"DDT is classified as "moderately toxic" by the United States National Toxicology Program (NTP)[48] and "moderately hazardous" by the World Health Organization (WHO), based on the rat oral LD50 of 113 mg/kg.[49] "
The LD50 of 113 mg/kg is the dose that would kill half of the rats exposed. If we extrapolate this result to humans, a 80kg person might consume 80 X 113 = 9040 mg and have a 50/50 chance of surviving. 9040 mg is just over 9 grams. Anyone drinking a 250mL glass of it would probably have a 100% chance of being fatally poisoned.
DDT is actually a white crystalline solid so perhaps you means a very dilute solution?
