Albolene mixed with a bit of silicone liquid (available at the hardware store in a spray can) makes an excellent floatant for fly-fishing flys! And later, in the tent, you can butter "it" up and squeeze off a couple!
A lube that doesn't make people suspicious is Chap-Stick. It's not the best, but it works pretty well. My favorite is the peppermint flavor, because the mint gives you that extra sensation!
I'd like to nominate Queen Helene Cocoa Butter Creme as the best masturbatory lubricant. It's inexpensive, lasts a very long time, and is easily available in the skin-care section of the drug store. No need to clean it off – it's good for your skin.
In all the biographies, I am amazed at the lack of knowledge about the best lubricant out there, as well as the easiest to clean up (or just leave on to no ill effect). The product is Aloe Vera Gel. This product is marketed for sunburn, bites, and so on, but it's perfect for every application I have read about in this forum. It's easily washed or wiped off, or if left on would be good for your skin. I actually use it as an aftershave, also (if anyone needs to know why you have that product). Don't get the kind with Lidocaine or Benzocaine.
Try egg white as a lube. It has a better viscosity than "pre-cum" and it's natural. Stay away from petroleum-based oils.