There is a (functioning) drinking water fountain near the toilets opposite gates S11 & S12 (Schengen area, i.e. before passport control).
I also copy here a reply I got today in the morning from Lisbon Airport:
Hello Julia. There are three water fountains, one in the baggage room (near the Customs), one at Gate 41 and one between Gates 7 and 13 (south pier). Still, we’re aware there should be more fountains and we’re working on it, hopefully just in time for your next visit. 🙂 Kind regards!
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