Growing bacterial culture on gelatin
You can use Gelatin - actually this was used by microbiologists before agar came in use. That gelatin is more or less completely abandoned in this field tells quite a story, right?

Gelatin has the main disadvantage that it cannot be autoclaved together with the medium to sterilize it. Using it would need some experience and probably advanced techniques to which you have no access.
But there are some good news as well: Agar is also used as a geling agent when making food, and when you cannot find it in your local supermarket, Amazon can deliver it. You don't need much, around 15 gram/litre.