You do not need to have Emergency fund setup to start investing into bitcoin, You can build it alongside your accumulating bitcoin. Waiting to setup your emergency fund before you start buying bitcoin can result in an unnecessary delay in your investment journey. You are set to start investing into bitcoin as soon as you have discretionary income present and a source of income. Periodically as you accumulate bitcoin, you can build out your backup funds alongside it and for the record, your emergency fund is to be build until it can cater for at least 3 moths of your expenses. Having built out your emergency fund, you can use the funds allocated to it to increase your aggressiveness in buying bitcoin.