Please be sure to double check with the church to see if they will allow it. I would also suggest one small tote and put the snakes into bags. As long as it doesn't get too hot or cold(not likely to get too cold around here even during a hurricane) they will be fine for a short period. YOu can also turn one loose at a time in the contianer to drink and stretch out.
BUT Double check the church's policies. If someone starts to freak out over there being snakes in containers, they might not freak over snakes tied into bags. Buy cheap pillow cases if nothing else(walmart) and use shoelaces to tie them securely.
YOur snakes can also sometime stay in the car during short periods of time ONLY WHEN THE TEMPURTURE IS RIGHT!!! Do not forget how hot cars get down ehre, and they do it quickly.
In the event of a hurricane I have multiple bags and each bag will be marked as I toss snakes into them with the snakes tag,(type sex etc) since I have hets. Then a certain number will be placed into a tote(holes already drilled. That way the snakes are totally secure, and I have totes to put them into later, just not all of them can be out at once. Remeber that lots of snakes do just fine in a bag during long periods of shipping.
Always have water, and dishes. If you think you have enough water, get more. You will run out.
I've living my entire life in Florida, and I ALWAYS know what I am going to do in the event I have to evacuate.
Generators (unless they are your OWN) will be allotted to more important things than heating a snake container. Trust me, people will not understand why you want to HEAT snakes when they want to have fans and such blowing instead. If it is YOUR generator then you won't have to worry.
I don't mean to sound harsh, but having gone through this better to be prepared than think it will be nothing.
Wolfy