Close to fosters. Hmm. Kind of tough with a kit. Id go the lager kit. 600gm ldme. 400gm dextrose and a steep of 20gm of pride of ringwood hops in boiled water for 20 mins. Usually you would use a lager yeast and ferment cool at about 10c but if you dont have a lager yeast or temp control just use the kit yeast but try to ferment about 17 or 18c. Will get you a drinkable aussie type beer.
would prefer to do a 23l brew as it last longer as I get through quite a lot! ill be buying a second set up soon also to play around with I was just curious on some mixes that would be as close to fosters as possible as that what I drink most days