Or split between a savings account and SSBs. Put two months of emergency reserve in the savings account, the rest into SSBs. This recipe will do better than 1%/year.
You're not required to segregate emergency reserve funds in a separate account from your day-to-day spending account. If you never let your day-to-day spending account dip below $X except in a genuine emergency (job loss, for example), then you have an emergency reserve of $X there. However, some people like having the separation for psychological reasons if nothing else.
A fixed deposit could be an emergency reserve if the bank allows a premature withdrawal with reasonable terms. You can also ladder fixed deposits to create a reasonable emergency reserve pool. For example, ICBC Singapore is currently offering a 1.8% interest 12 month fixed deposit, minimum $500. You have to open this fixed deposit online, but you can open a savings account with ICBC with $500 with no minimum balance requirement. If you then create a "ladder" with, say, $1000 fixed deposits maturing every month for 12 months, then you have a sequence of 12 fixed deposits that generate $1,018 of monthly income to support an emergency of up to 12 months....
....But this arrangement is only for certain kinds of emergencies, such as unemployment for up to 12 months. It's not too great for emergencies that require a large dollop of cash, unless the fixed deposits can be redeemed prematurely without too much difficulty or cost. Of course you can combine approaches: a dollop of reserve cash plus laddered fixed deposits.