I don't know how to hide the answer under a spoiler, but the spoiler is the answer as I understood this part.
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Alex, as Byte said, does not need food or air, but still partially need breathes, which means he also need eats. He continues to drink water to stay hydrated. Water has minerals etc., so he is essentially eating water. He will only absorb these medicines poorly, but still absorb them. I don't think they will decay in him while he drinks water. There was a moment where Alex swallowed Loken's seed. Byte said to just wash it down to dilute it. Although, nevertheless, in the future Alex will eat the seed again through another hole... Whether he cleaned himself or left everything in himself is not said. 😈😈😈😈