Open Bitcoin Core and set it up as a pruned node, the amount for the blockchain doesn't need to be large, you can stick to the default of 2, 5 or 20GB (forgot what the default is, my nodes aren't pruned). When it start to sync, take your device offline to interrupt blockchain download temporarily.
I don't remember the default size either, but i'm sure it has minimum 2GB these days. Although you'll need additional 11GB[1] to store all UTXO on disk.
[1]
https://statoshi.info/d/000000009/unspent-transaction-output-set