For what part of the circuit? The 4.5 V supply or the elsewhere in the signal path? Pretty much any single supply opamp can be used for the supply (e.g. an LM358), but if you’re going to use opamps elsewhere things may get trickier (but hopefully the schematics has some suggestions for that case).
(I tend to feed ±12 V also to lower-voltage things I’m integrating with the rest of my “system”, since I have both voltages anyway and I can power most opamps from the dual supply even if the rest of the circuit is single supply, but that’s obviously not an option for all builds (e.g. this thing uses a ±12 V TL072 to generate a variable 2-6 V rail for the CMOS stage, but the output stage is powered with ±12 V instead of a 12 V single supply as in the original).