As above really, diagnosis is always harder than the fix.
What resources do you have on board? Cable, pipe, FSM, MM, are you alone, water and food, meds if needed, can you walk out?
Try this first, if you or a friend has some gasoline in a can, then pour a little more than a thimble full into the air intake, or syphon some. If the engine at least fires and runs for a second or two, then you now know your entire ignition circuit is good.
Now you need to look at fuel supply, a blocked filter would unlikely kill an engine immediately, normally a lack of power comes long before the filter blocks.
If you switch on the ignition and watch the dashboard lights, you should see them brighten after a few seconds, this would indicate the fuel pump and relay supplies are good. If not then pull the fuel relay and in the relay socket bridge the two largest connections with a piece of wire, this bypass will eliminate a faulty relay or signal from the ECU.
If the engine runs then get yourself home or to a garage if you're not motor savvy to get the problem sorted. Do NOT leave the wire in place, doing so will keep the fuel pump running, a leaking injector will allow a cylinder to fill with fuel...not good!
If you're fuel pump does not run, then your looking at your back up plan to get you out of trouble.
If the engine did not fire with the 'thimble' test you could be heading for a long line of tests, immobiliser, distributor, a cable, it could be many things.
Regards
Dave.