Do you know about apple trees?

[Thumpalumpacus]

I don't know much about apple trees at all -- and little more about horticulture, really -- but start with a good soil. That means, get some mulch together, start composting (eggshells, coffeegrounds, paper towels, vegetable remnants), mix the mulch and compost together to make fresh soil, turn the soil around the tree and work the new soil in, and then, yes, water it. Fruit trees need water to produce meaty fruit.

The advice about going to a nursery will probably be more useful, but hopefully this will help you a bit.