Planejammer Campaign Setting
Potion of The Helmsman
This potion allows a non-spell casting individual to spelljam as if there were a spell caster of the same level with a full compliment of spells memorized. The potion allows the drinker to spelljam for a number of hours equal to 12 plus his CON bonus. At the end of that time the ’jammer is exhausted and suffers a -4 to hit, skill checks, and on saving throws until he has rested for eight hours.
1,500 gp each
Adapted from work by Terry Hawkins for Spelljammer.org