How can I create AND/OR logic gates using comparators?
AND gate with wired-or comparator:







simulate this circuit &ndash; Schematic created using CircuitLab

You can invert either input (or both) by swapping the respective inverting and non-inverting inputs. Be sure to check fanout in your desired system configuration. 

But if you want really low current, just buy some CMOS or HCMOS logic chips.