SodaStream 4-Piece Classics Sparkling Drink Mix Variety Set

I actually bought this for my boyfriend who is always on the hunt for something other than water to drink (he drinks a significant amount of water, and isn't super huge of a fan of seltzer, like myself). That said, I asked if this is something he wanted to try for when he visits. He seems to love all of them. He said that Dr Pete was very similar to Dr Pepper. I haven't heard anything negative regarding the others, so I assume he likes them all. I will say this, however, I feel like a spout, or something would work better when pouring, considering pouring most liquids into seltzer causes bubbling and sometimes overflow, if one isn't careful. I've tried to pour slowly, but then it'll drip either onto the bottle itself, or on the counter/in the sink. Better application ideas would be great.