Salamualikum sheikh, my grandmother recently passed away, can they delay the burial until my father reaches to the location? It will take 2 days or maybe 1. Also is it true that nothing can be cooked in our home for 3 days now?

Ustadh AbdulAziz al-Haqqan

The sunnah is hurrying up with the burial, as for making food for yourselves only then that's allowed as who will make food for you.