So sorry to hear this. It is really stressful as I lived up through it not once but 3 times. My advise is don't panic. What will happen with the fish has already happened. It's easy for me to say it now though, while I am not in that situation at the moment.
I had my fish in totes for nearly 3 months the last time deliberating to get rid of all of them as I could not imagine setting up another glass tank and dreading the doom day again. In the end I could not part with them so I got into plastics
I have a plastic pond now..
My advise is, feed extremely sparingly in the totes, do daily large water changes if you can and take your time setting up another tank. The fish will be fine, as long as your totes are not overstocked and you change the water. Get more totes if needs be and split the fish, providing you have cycled filters. I had all mine sitting in the middle of the sitting room....my family was not that enthusiastic about it
Also, I am assuming you're using the filters that were in the main tank? I had to shorten my intakes/outlets on mine to make them work in the totes. I lost no fish but this is because "last time"(and I hope it stays that way..
) was the 3rd time in the space of a year or so, 3 tanks leaking, so I already owned empty plastic totes from the previous disasters, and I was able to split the fish as I liked, none tote was overstocked and each had one large cycled external filter. I had hundreds of shrimp that I could not manage to save and watched them die slowly...which kept me awake some nights afterwards....
Good luck and I hope you sort it out sooner for peace of mind.