I have been using this simple recipe for a couple of years now. I choose to put in a non-paraben preservative - I don't want to worry about spreading bacteria, mold or fungi on my little one's bodies. The ingredients you might not have on hand, ewax and preservative, can be ordered online - I like to order from brambleberry.com, snowdriftfarm.com and the-sage.com.
Here's a tutorial on how to make lotion, if you haven't done it before you will need these instructions:
http://www.snowdriftfarm.com/lotionmaking101.html
The tools you will need are mainly an accurate scale that can measure in fractions of grams, and a stick blender, as well as some containers to put the finished lotion in. I don't recommend reusing containers, they are virtually impossible to clean well enough and lotion stored in used containers always ends up growing something ugly. It's worth a few bucks to get the clean new containers.
ACV lotion:
23% Rice bran or other light oil
3% jojoba oil if you have it, otherwise add same amount of other oil
5% emulsifying wax
4% glycerin
4% apple cider vinegar
1% lavender or other essential oil (don't use citrus eo's, they cause photosensitivity) or,even better, leave it unscented for little ones and sensitive individuals. If doing unscented add that 1% in to an oil.
use correct % of preservative as recommended by manufacturer
60% distilled water (will actually be 60% minus the % of preservative, to keep the total at 100%)
prepare your mixing containers and measure all your ingredients. Follow the instructions in the tutorial for heating and mixing the lotion ingredients properly.
The finished lotion will have a slight acv scent to it.