It is, anyway, a good idea to have a second, even small, pot at hand. You can brew your plants one time, filter them and let the liquid rest of the first brew in the second pot.
Refill big pot with water, cook slowly, and after reunite your several brews without the plant matérial to reduce further .
That's why many people refer to some pots, it is only for practical reasons a good idea to have two or three other recipients nearby to make the filtering, collecting and finally the reducing.
In this video you can see the manufacturing of daime which is essentially a one pot method.
https://m.youtube.com/watch?v=UH6zL2gYkpcArthur Dee was one of the greatest alchemists of all time, not likely to his dad, I forgot his name, this small James Bond sorcerer working for the queen of a... Hail Arthur!