What specific improvised materials were mandated for connecting the square Command Module CO2 canisters to the LM's round receptacles?
Answer
Duct tape, plastic bags, and mission instruction manuals
To combat the rapidly building carbon dioxide levels, engineers in Houston devised a procedure to use the spare, square lithium hydroxide canisters from the Command Module, which had a larger capacity than the LM's standard supply. The challenge was fitting these square components into the round receptacles inside the Lunar Module. This required an unprecedented feat of improvisation, utilizing materials readily available to the crew: readily accessible duct tape, plastic bags for creating necessary interfaces or seals, and even the physical pages of the mission instruction manuals themselves to fabricate the required adapters.

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