As Cuba has grappled with electricity failures and natural disasters, Americans with family on the island and tourists considering visiting have been mobilizing to provide much-needed aid. For both groups, the situation has been cause for worry, extra precautions and planning.

In the past few weeks, Cuba has struggled with nationwide blackouts, two major hurricanes and a 6.8 magnitude earthquake — blows to an already weakened infrastructure. Residents have been left without power for hours…