According to Space Exploration and Humanity: A Historical Encyclopedia:
During Vostok, Voskhod, and Soyuz flights, urine and feces were entrained in an air stream and collected for disposal at the end of the mission
Spaceflight Life Support and Biospherics makes the same claim.
This suggests, remarkably, that there was a form of space toilet aboard or at ...
I would think that they would just hold it as the whole trip is only 8 minutes and it the g-force is large so you would just go up there.
I hope this can help:
They use three high-tech procedures:
They schedule and ration their fluid and food intake.
They go to the bathroom before the trip.
They wear diapers, sorry, I meant Maximum Absorbency Garment.
In other words: they do exactly what you do before a trip. Minus the diaper, probably.
So, the answer to your question is the third point: they just pee in their ...
One of the main traditions and rituals of Soviet cosmonautics- all crew must urinate on the right rear wheel of their bus: https://www.bbc.com/future/article/20140610-the-strange-rituals-of-cosmonauts
With a cleansing enema launch day begins.
To help ease our difficulty, we are offered a pre-launch enema. Administered by our flight surgeons, this allows us ...
First let's review the nominal operation of the Shuttle Waste Collection System (WCS).
(from Shuttle Crew Operations Manual (SCOM) page 2.25-2)
It was divided into two major systems, one for urine and one for feces.
The urinal consisted of a hose with a crewperson's personal funnel
attached at the business end and fan/separator units at the other.
The fan ...