1. Not sure, ordering some of Lindsay's mac & jojoba in, never tried others yet, but I've seen plugs for Lindsay's (Soaper's Workshop), Bitter Creek North, Majestic Mountain Sage. 2. MMS has some pre-sweetened flavor oils and I think they have a sweetener called sugar kisses. Brambleberry also has pre-sweetened flavor oils, and powdered stevia. Liquid stevia should be fine, though you may have to be careful to keep stirring til it's cool enough that it won't separate. I've had honey pockets if I don't stir long enough. NOT nice! Other options are honey and agave nectar. 3. Not sure what "best" means... cheapest? most elegant looking? 4. A quick search for "lip safe colorants" should pull up quite a few hits. In a pinch you can just shave off a little bit of lipstick and add that to the mix. For quick and easy, you may want to try lip balm kits. Lindsay at Soaper's Workshop has some reasonably priced lip balm kits that have 16oz of lip balm base, 100 lip balm tubes, enough flavor oil for the base and some pipettes for pouring. I can't wait for my mac & jojoba one!