90s Star 'Parker Lewis' -- Gimp on Aisle 4

The guy who played Parker Lewis in the 90s sitcom "Parker Lewis Can't Lose" is slowly piecing his old life together after a near-death boating accident left him with a shattered leg ... starting with a casual trip to the grocery store.

The grocery run pic was snapped earlier this month -- and 41-year-old Corin Nemec tells TMZ, getting back into his old swing of things is really tough, especially in a wheelchair ... which he'll be stuck in for at least four more months.

And to add insult to injury, Nemec tells us, he's already had his first embarrassing moment -- after his motorized cart stalled out at the supermarket ... and he was stuck in the aisle, yelling for help.

As we reported, Nemec nearly died in the January accident in Belize, while filming “Poseidon Rex." Nemec was riding on a Coast Guard vessel when it crashed into a barge ... breaking his femur in 3 places.

Nemec's making a solid recovery ... but says if he doesn't heal to his doc's satisfaction, he'll have to undergo bone grafting surgery.