How is water transferred from outside the suit to inside the suit?
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$\begingroup$ If an astronaut wearing a space suit gets dehydrated during an EVA, something was wrong about EVA planing and implementation. $\endgroup$– UweJan 27, 2019 at 18:51
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$\begingroup$ @Uwe the Apollo port wasn't for EVA, see my answer. $\endgroup$– Organic MarbleJan 27, 2019 at 18:52
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1$\begingroup$ If an astronaut on an EVA gets dehydrated, it means one or more of three things have happened: (1) the suit has malfunctioned, (2) something is wrong with the astronaut, or (3) the EVA has gone on far longer than planned. In all cases, the response is for the astronaut to return to the vehicle and get out of the spacesuit. $\endgroup$– David HammenJan 27, 2019 at 18:58
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Apollo suits had a "food/drink port" but it was apparently never used. The main purpose of the port was to allow the crew to eat and drink in a contingency situation where the vehicle was depressurized and they had to survive in the suits for an extended period of time.
In case of complete loss of cabin pressure during a mission, the crewmen might be required to wear pressurized suits continuously for as long as 115 hours. Water would be available by passing the probe of the potable-water dispenser through the helmet feedport.
Current US suits have an internal drink bag.
(image here)
answered Jan 27, 2019 at 18:32