I've been given an old Gaggia Espresso Dose machine and I want to see if I can get a decent coffee out of it. Being new to an espresso machine, I didn't want to waste good beans on it initially, so I bought some cheap pre ground coffee (Chicco D'Oro) from the supermarket and tried it out. The coffee comes out initially OK, but quickly starts spurting and running watery. I guess it's either channelling or is too coarse, or both? I checked the coffee packet and realised it says suitable for filter and plunger. So I suppose it's too coarse for espresso?
Any recommendations for a cheapish pre ground supermarket coffee I can use that's fine enough for espresso? I realise I probably won't get a good taste, but want to hopefully get to a point where the coffee is not watery and is pouring correctly before going to better ingredients.
I do have a hand grinder but from what I've read it's not suitable for espresso.
Ex-barista here - grind your own, don't take shortcuts or you'll just keep wasting coffee and money