ZCS
BMO SHORT CORPORATE BOND INDEX
stock TSE

I use ZCS as I can accept a 10% drawdown if necessary as it’s an outsized emergency fund instead of for a single purpose, but those listed (I like ZMMK or CMR depending on the dollar amounts your needing to buy and sell) are the best bet if you do not have room for error. Even ZCS could theoretically be affected by a large crash, but money markets almost got smoked during the financial crisis so nothings perfect, but it depends what worst case scenario you can afford.
If we have a sector panic that bleeds to corporate bonds, ZCS will fall hard temporarily. If it crashed right when you needed it, do you have any flexibility, or can you afford to take the 10% hit?
If you have no flexibility on withdraws or you will not quite have enough in there so any haircut will delay your purchase, a CMR or ZMMK is your best bet.

I use ZCS as I can accept a 10% drawdown if necessary as it’s an outsized emergency fund instead of for a single purpose, but those listed (I like ZMMK or CMR depending on the dollar amounts your needing to buy and sell) are the best bet if you do not have room for error. Even ZCS could theoretically be affected by a large crash, but money markets almost got smoked during the financial crisis so nothings perfect, but it depends what worst case scenario you can afford.
If we have a sector panic that bleeds to corporate bonds, ZCS will fall hard temporarily. If it crashed right when you needed it, do you have any flexibility, or can you afford to take the 10% hit?
If you have no flexibility on withdraws or you will not quite have enough in there so any haircut will delay your purchase, a CMR or ZMMK is your best bet.