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thylacine_chevron posted on r/sodastream2w
Those water bottle powdered drink packets you can buy. Pour the powder in a VERY BIG glass.20-40oz. then pour the sparkling water over it and give it a mix and some ice. If you only do like 16 oz they're pretty concentrated but if you do like 24 oz + they're less intense/better. There are so many flavors too like jolly rancher. There are propel ones with electrolytes and there are energy ones with caffeine. All sorts of flavors and styles. Dollar tree has a good selection. Target and Walmart also have quite a few. https://www.walmart.com/ip/43336945?sid=9f435b60-1e4b-495e-87ff-3cc56cb250b0