M new here n was really concerned about the lubes so here it is... I used Nivea lotion (for dry skin)
It includes Aqua so its water based its real cheap cause i got it in UK for like £3 and i believe it will be something around $5 in the US
plus i also tried the "test" by rubbing it on a white cloth and then washing it with only water and there are no stains.... I think its the cheapest thing i cud get!!!
though m yet to see how it effects the fleshlight