"The idea of drinking piss is simply intolerable," the Aargauer Zeitung website quoted the 34-year-old player as saying, adding that he was waiting for an analysis of video evidence before further action.
"What if next time it is something that knocks you out?," added Felder.
Swiss tabloid Blick reported that the unidentified fans had persuaded a ball boy behind the goal to pass them the bottle during the second half of the match.
The paper said the fans shouted "Now you have AIDS" after Felder realised what had happened.
Muri coach Beat Hubeli was shocked
"That's bottom drawer," he said. "I've played football and experienced a lot but that beats everything."
Baden president Thomi Bram apologised to the goalkeeper on the club website and said they were conducting an internal investigation.
Condemning the fans for damaging the club's reputation with their 'reprehensible' behaviour, he said he had apologised in person to the goalkeeper, coach and Muri president and informed the Swiss football authorities.
(Reporting by Alan Baldwin, editing by Ed Osmond)
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