Yes, alcohol is allowed in Drottningholms slottspark.
( see answer 14 here: tripadvisor.com/ShowTopic-g189852-i233-k5489… )
There are only a few parks where alcohol is not allowed at all, most parks have the regulation that you can have a wine picnic until midnight.
Drottningholm has a lovely english park that is very popular for picnics. And it just cries out for Champagne!
Just remember that alcohol is only sold in the state monopoly stores, Systembolaget. There is one in Hötorgshallen, if you're getting your picnic there (otherwise most Swedes will know where to find the nearest one).
Systembolaget does not sell any products chilled, so if getting white or sparkling wine, you might want to do some preparations ...
Re picnic food: If you can't get to the Saluhall, and are in Gamla Stan, there's a moderate-sized supermarket on top of the Gamla Stan Metro station called Munkbrohallen. For its size, it has a surprisingly good gourmet cold-cuts and cheese counter, plus fresh baked breads and rolls.
Re picnic wine: As we found out the hard way, most of the State liquor/wine stores, including the one in Gamla Stan, aren't open on Saturday or Sunday.
Re picnic alternative at Drottningholm: The food in the cafe on the Palace grounds was surprisingly good, especially the fish soup -- like a really good bouillabaise -- and the Toast Skagen -- a huge portion of excellent shrimp salad. There are tables outside the cafe with a fine view of the lake.
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