Remember, alliteration is the repetition of the same consonant sound.
These might help you to remember…
A proper copper coffee pot.
Red Leather Yellow Leather
Peter Piper picked a peck of pickled peppers.
She sells sea-shells on the sea-shore.
The shells she sells are sea-shells, for sure.
Betty bought a bit of butter and put it in her batter
But the bit of butter Betty bought made her batter bitter.
So Betty bought a better bit of butter and put it in her batter.
The better bit of butter Betty bought made her batter better.