Yeah, absolutely! It’s rough but it works pretty well.
Get a mug of oats and soak them for at least 30 minutes, longer seems to be better but idk.
Once soaked, drain and wash those oats.
Pop them in a big bowl (if using a hand blender) or food processor with between 500ml and 750ml of water, depending on how thick you want it.
Blend it until smooth/you can’t be bothered anymore (that’s generally when I check out).
Strain through a sieve and tea towel, muslin, or nut bag (haha) - you’re going to have to do some squeezing, it might get a bit messy.
Voila, oat milk! You’re going to need to give it a good old shake before use, but it’s nice in hot drinks/on its own/on cereal etc. You can add salt or sugar if you’re so inclined, but I don’t bother. Better to start with a bit less water, you can always add more if it’s too thick.
The actual hands-on bit takes around 10 minutes at the very most, and that includes time which is me futzing around in my kitchen trying to find stuff so if you’re better organised it could be even quicker.
Oh yeah, I use the little oats, not the big flat oats. Just the Co Op normal ones are fine.