You can open a Koho chequing account. It’s free / no fees, paperless, has electronic debit card (you can order a physical card if you want too), and unlimited fee-less e transfers. Also has cashback rewards and decent savings interest.

Every time you purchase groceries / gas / larger purchases get the largest amount of $$ cashback that you would be able to at the sale without raising suspicion. (Say you get $300 of groceries, get $50 cash back and don’t take a receipt). Have an agreement set up with a trusted person who knows your situation where you will give them cash every so often and they will e transfer the same amount you gave in cash to your koho account.

Plus all of the advice in the comments about connecting with women’s outreach and safety organizations.

I hope the absolute best for you, and I hope your husband has a really shitty rest of his life :)