I have a customer that requested a dairy free cake and BC because her daughter has a dairy allergy! Please help! Thank you!!!
You can use a dairy free spread for your buttercream in place of butter and usewater in place of milk.
For the cake there are many options. If you do a little of your own research you will find them easily. You can use coconut milk/almond milk etc. Find an oil based recipe instead of a butter based one etc.
Many many options, you just need to do your own research and find one that you are happy with. GOOGLE is your friend here. It will often bring you back to one of the posts here and you can read through them.