There was no official project called "TWINKIES". It is likely you are referring to the "Twinkie Defense" a term coined in the 1970s, which described a hypothetical military strategy of using large quantities of Twinkies as a weapon.

This was meant to be a satirical commentary on the perceived absurdity of the Cold War arms race, and was not a serious proposal.

Therefore, there was no actual liquid used in this fictional scenario.