I've had it with paying for labs to do my negs. It's time to start saving money.

1- Can I use one developer for Neopan/Tri-X/Ilford including ISO from 100 to 400 or is it better to use brand specific developer for each film brand?

2-Should I buy a tent or seal my bathroom? If the tent is just as reliable, IŽd rather do that than sit in the dark.

3-How do I keep temperature constant? This has always been my fear.

4-Finally, what equipment should I get?

Many thanks in advance for feedback.