Keep the cage, keep the night
The single kindest preparation is sameness. If the boarder agrees, send your budgie in its own cage, or its familiar smaller sleep cage, with perches and toys where they always are, rather than asking a small bird to learn new bars, new cups, and new neighbors all on its first night away. Pack the cover it sleeps under at home, because the shape of darkness it knows is a real comfort, and confirm where the cage will stand: a quiet room away from cats, kitchen fumes, and direct sun, with no other birds' cages pushed against its own.
Pack the exact diet, plus a bribe
First nights go better on familiar fuel. Send the precise seed mix or pellets your budgie eats, portioned or with clear instructions, plus fresh food it reliably accepts and a spray of millet labeled as the settling treat. Tell the boarder plainly if your bird is a seed enthusiast that must not simply be topped up with more seed instead of its balanced foods, and ask what fresh items they will provide so nothing untested appears in the cup on night one. Include your vet's details and permission for emergency care in writing.
Rehearse the journey, not the separation
If car rides and the carrier are new, rehearse those, briefly and kindly, in the days before: the covered carrier on the floor to explore, a short sit in the parked car, then a brief drive ending back home with millet. A budgie that finds the carrier boring arrives at the boarder's with one fear already removed. A full overnight trial is more than a single first night requires, but do make sure the boarder has handled budgies before and knows how a healthy one sounds, eats, and sleeps.
Write the routine like the boarder is you
Boarder notes fail when they describe the owner instead of the bird. Write what yours actually does: lights out and cover at a set time, morning uncover and fresh water, how much seed goes in and when, which whistles mean contact-calling, and what 'quiet and fluffed' should prompt, which is a call to you or the vet, not a wait. Add handling truthfully, whether your budgie steps up happily or prefers to stay in-cage, so nobody spends the evening chasing it around a strange room.
The morning after matters too
Agree how you will hear it went: a short message after the first night covering eating, droppings, sleep, and mood tells you the preparation worked and tells the boarder you are paying attention. When you collect your budgie, ask what it actually ate and how it slept, and bring it home to its usual cage setup and routine rather than a celebratory fuss.
Sharing that written routine through KinsLe's Care Pass gives the boarder temporary, clear access to this budgie's feeding, bedtime, and vet details for the whole stay.