I would start by giving thought to the circuit that Boncuk presented. Using thermistors and bridges just gets into more to worry about. Try with a simple focus on using transistors like a 2N3904 for starters. I am sure a Google of Temperature Measurement with 2N3904 will bring a bunch of hits. Get familiar with using a low constant current source through a pair of transistors and measuring the subsequent voltage drops across each. Anyway, I never did it but how I would likely look to do it. Then comes a means to calibrate it and get it accurate. Anyway, I liked Boncuk's suggestion.
Ron