I highly recommend Sliquid for a lubricant. We have tried many others, and none compare.
https://sliquid.com/shop/sliquid-naturals/h2o-sliquid-naturals/
^ This is the water based, which is nice for those that prefer it
https://sliquid.com/shop/sliquid-naturals/silk-sliquid-naturals/
^ This is the hybrid lubricant, our holy grail. It has a little silicone in it, which keeps it from drying out and getting gummy, while still feeling natural and not leaving us with a greasy clean up.
The Sliquid Silk hybrid lube was also tested and is silicone toy safe. We have personally tested it with every toy we have, including Bad Dragon soft and medium, leaving it on the test pucks for a few days with no change in the material.
Also here is a lovely list of lubes tested for ph and osmolality:
https://phallophilereviews.com/ph-balanced-lubricant-guide-safety/