hmm.... good question........

tool: I think knives.. I use them for everything... they are even handy as screwdrivers :P

machine: microwave... no doubt

food: here´s the tricky one... but the food I HAVE TO HAVE ALWAYS is CHEESE!!!... I can eat, and snack and chomp on it non-stop..... so that´s a must

then for the liquid part there´s also jamaica or lemonade concentrate powder for making beverage....and of course water.... LOL