The even temp of you house is important, 70 is best, I use a cardboard computer paper box, and put it inside a bigger one that is slightly shorter.I put a glass from an old pic frame on the top of the box Duct Tape works. I use a 25 watt light bulb that has a Metal heat reflector, and a clamp, (I don't use the clamp) I cut the short edge of the box down the middle 3/4ths the way down. and slide the lamp down the slot I made, so the rim of the deflector rests on the pie pan I have underneath, and I put in 3 air holes. above that I suspend a wire basket with the wings on the edges (i make it out of small hole chick flooring) that fold over the box. this takes advantage of the rising heat, get a thermometer and get the temp 99.5 right for a couple of days. for water I put in a 1/2 cup in the evening every other day or so, watching the air cell as I go, on day 7 if air cell is too high I put out less water if to low more water. Water is most important day 18. I Turn eggs 3 times a day until day 18.
You will hear a lot of squaking in here about lamps and yes you have to be careful, I have enlarged the lettering above to show where I am being careful with the lamp, but if you have animals or kids in the house than this whole do it yourself idea may be for the birds. I have been raising chickens for 40 years, and have hatched out may chickens this way so if you screw up you are on your own. You can lose a lot of sleep hatching chicks, best advise is to just by some. Especially if you are new to chickens.