You know, even if you have one of those hot water bottles, you could fill it with very warm (not boiling...you don't want to burn the kittens) water, and wrap it in towels, or an old sweatshirt, and lay the kittens on that to keep them warm. You'd have to keep rewarming the water, but it would work.
My mother in-law was the master at taking care of abandoned orphaned kittens, and this was like 20 years ago...but she used to rotate old towels on a very low heat setting in her oven to keep her kittens warm. Not the safest thing, but if you warmed them for like 5 mins. in the oven on 150 degrees, it may not be too bad of an idea. JUST BE CAREFUL IF YOU NEED TO DO THIS AS A LAST RESORT.
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SORRY...I just saw that you don't have a hot water bottle.
As far as a funnel goes, take a piece of heavy paper (you'll probably need several, as you know what happens to paper products when they get wet), and form a cone with the paper...that will work to funnel your kitten formula into the bottles.
Have you been to
http://www.kitten-rescue.com/ yet? If not, take a look at it...it will be especially helpful if momma cat rejects the kittens or refuses to nurse them.
Best of luck to you...we all admire your fortitude and positive attitude about all of the events in your life recently.