You can find several free, high-quality versions on IMSLP or a simplified arrangement at Corpus Christi Watershed.
For a deep dive into George Frideric Handel’s famous "Hornpipe" from Water Music and its life on the organ, the research paper from The Handel Institute is an excellent starting point. It explores the history and sources of this bouncy Baroque tune, which was popular enough to be adapted for everything from taverns to royal courts. Insights from the Paper & Research
: The most authoritative source for public domain scores. Look for the organ arrangements by McKinley or Boniteau under the "Arrangements and Transcriptions" tab [22, 26, 29].