We're in a volatile market, prices can change at any time, and we can't use bitcoin as a tool to help us do something unexpected.
I prefer to deposit money in the bank to meet urgent needs. Bitcoin is a long-term investment.
If you are using your fiat saved in a bank as an emergency fund that is fine, since in an emergency you need fast access to your money but never save money in fiat for the long term, you will lose money if you do that, so if you have some money to save for the long term find another way to do that, obviously we prefer bitcoin or other cryptocurrencies but if you like gold, silver, stocks or other forms of investment that is fine as well.