Big hugs xx Sorry to read about your Dad's passing
If you will be more comfortable bottle feeding during the funeral, do it. Perhaps your DH would be able to feed her outside/at the back and you would be able to participate in the funeral with a little less worry.
At this point given you have only a few days to know if she'll take the bottle or not, I'd offer once a day, maybe around the time she's likely to get a bottle and see how she goes. I don't know of any guaranteed way to get a baby to take a bottle in 4 days. The ways to prevent bottle preference are really just minimising use and keeping a slow flow teat.
At that age, DS would take 3-4oz in a feeding. Here's some info:
http://kellymom.com/bf/pumpingmoms/pumping/milkcalc/Here's some info on storing/how long milk lasts in certain environments:
http://kellymom.com/bf/pumpingmoms/milkstorage/milkstorage/You can refridgerate it and reheat by putting the bottle in a container of warm water til it reaches body temp (test on inside of your wrist before feeding to baby). I have offered it cold (warmed between my legs to take the chill off) but its not a great idea at this age because it can bring down baby's core temperature and LO may not take it if she's used to milk fresh from you and nice and warm. Best to swirl the bottle to mix in the fat that creates a layer on the top rather than shaking - keeps all the good cells and proteins in the right shape and functional.