You can just make porridge with normal oats and alternative milk ☺️ As for feeding he has what we do, we just use dairy alternatives to milk and butter when cooking.
@Becky i have done and he hates it! i think its the texture of the oats rather than the actual taste!
We use may contain all the time as in the UK it's not a legal requirement to state it may contain Also if your kitchen contains fairy everything becomes a may contain Although I have read people saying ready brek is a very high risk of cross contamination
Also if baby doesn't like the texture you can blend them to make them smooth like ready brek
We still eat ‘may contains’ and have never had an issue, otherwise I feel like it would be so much harder finding things to eat! My favourite allergy friendly cookbook is ‘Feed Your Family Daily Free’ on Amazon, soo many good recipes that the whole family can eat!