Just to clarify, you need a current source with any RTD. Ohm's law pretty much requires it.
Also, with 2 wire RTDs, you need to account for line resistance, this is why a 3 or 4 wire configuration is more accurate: it negates the line resistance of the wire.
You could do a 2-wire setup, you would just have to calibrate the rtd measurement system. RTDs are not linear temperature devices, meaning that of 0 degrees is 0 volts, and 100 degrees is 100 volts, 50 degrees won't be 50 degrees. It might be close, but curve fitting is required. I generally use 4th degree polynomials when curve fitting a calibration curve. Best way to calibrate is to use a dekade box and inject the resistances that correspond to a given temperature. Without this, a small added lead resistance can lead to huge errors in temperature. A 4 ohm change corresponds to roughly 50 degrees. 10 feet of 20 AWG wire would have a resistance of around 0.1 Ohms, that works out to be about 1/2 a degree.
Granted, I'm used to dealing with tighter accuracy requirements than the average home brewer probably cares about, but you'll have to decide for yourself if you want to give up accuracy.
Generally get thermocouples and rtds from Omega