I got something like this..

https://www.amazon.com/dp/B08C4T1PL6/ref=cm_sw_r_cp_apa_glt_fabc_85R1A2KNCYW6ENPS55H6?_encoding=UTF8&psc=1

CGA320 to sodastream adapter.

I got mine from aliexpress, so it took a month to arrive, but it was a little cheaper lol