That might not really be on offer. If the referendum is on the final deal, it might be that or no deal. Any second referendum that has Remain as a possibility, needs further negotiation to have been held with the EU and for them to agree a Stay deal, agreed by all 27 members.
I am really not sure that deal vs no-deal is actually a possibility albeit that many politicians claim as such.
There are far too many issues where there simply isn't a 'no deal' default - these issues have to be sorted and there has to be some kind of agreement.
Examples being:
1. Future payment on financial obligations
2. Status of many EU citizens in the UK and vice versa - particularly kids born here but not actually UK citizens for example.
3. Virtually every regulation etc that has come in after the UK joined and where there isn't an obvious fall back position - I think aviation was one case regularly mentioned.
The whole deal vs no deal seems entirely focussed on trade, but this is one one of many, many issues that have to be hammered out, most of which don't have the kind of suggested WTO fall back position. So these areas would fall into a kind of regulatory/legalistic limbo without a deal, which may indeed be incompatible with international law (e.g. on citizen's rights).
Some have also suggested that a range of deal options could be proposed - but this again, I think, is fantasy - the EU will only negotiate a single deal - that is all that will be on the table - we wont be able to pick and mix between Norway vs Canada etc.
So theoretically you cold have a deal vs no deal referendum, but the latter would be undeliverable (except on trade) so isn't actually a viable option.