76 grams is still pretty small so if she is eating you should try and feed her every 4 days. My babies all get fed pretty heavy in the beginning until they are at a weight I am more comfortable with. Are you having troubles getting her to eat? I've always just used tap water, and it's perfectly fine. The only pet that I'm aware of that needs distilled water is fish. Which really you don't even need to buy distilled water, if you fill a jug of tap water and leave it out for 8+ hours you can use it in your fish tank just like distilled water.