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Bag of ice
They have Ice in the Carrefour at the Bascule and also try Picard: http://magasins.picard.fr/search?query=bruxelles
Ice also at the GB Express on the corner at place flagey.
In fact you can find ice at alot of the night shops run by asians...just expect to pay a bit bit more...but handy for the late night cocktail run...
I always buy ice for parties at www.laglaciere.be - very close to bd. de waterloo in st. gilles.