They have a duty-free liquor shop in T3 arrivals just before immigration, but I'm not sure if they'd be subject to the 100ml liquor rule if in a sealed bag. In any case, it'd be safer to buy/bring bottles under 10cl. I'm not aware of the existence of any stores selling duty-free alcohol on the domestic side of the terminal, and being duty-free I don't expect to find one either.

There aren't any rules in place regarding transporting liquor on domestic flights per se. Also bear in mind that there is a 1 litre limit per passenger for all alcoholic products you are taking into the country.