With current technology -- warp drives need not apply -- we could build a giant rocket that is propelled by hydrogen bomb detonations behind a pusher plate. This concept was actually researched by the government in the 1950s and 60s and showed promised for interstellar flight (though it couldn't be operated within a million miles of Earth, and we've yet to travel a million miles from Earth, so it still isn't practical . . . but it is possible).
Anyhow, maximum speed for nuclear pulse was three percent light speed. Thus it would take three thousand years to travel ninety light years.
A multi-generational city-sized space ark would be appropriate.
That's going to take significant time to build even before the expedition sets out. We better start today.