if you want to show any one out three then use
$result = mysqli_query($con, "SELECT meal, price FROM Meals LIMIT 1");
if ($row = $result->fetch_assoc()) {
echo '<input name="price" type="text" value="'.$row['price'].'" />';
}
if you want to show a specific one then use id or any primary key in your query.
like
$result = mysqli_query($con, "SELECT meal, price FROM Meals WHERE id='your id or primary key value' LIMIT 1");
if ($row = $result->fetch_assoc()) {
echo '<input name="price" type="text" value="'.$row['price'].'" />';
}
in short use your query according to what kind of result do you want.