Please share this suggested wording with your legal advisor.
I give to Alice Peck Day Memorial Hospital, a incorp_state non-profit (Tax ID #02-0222791), or its successor, the sum of $___________________, for any purpose as Alice Peck Day deems appropriate.
I give to Alice Peck Day Memorial Hospital, a incorp_state non-profit (Tax ID #02-0222791), or its successor (the real estate located at __________________ or 1000 shares of XYZ stock), for any purpose as Alice Peck Day deems appropriate.
I give to Alice Peck Day Memorial Hospital, a incorp_state non-profit (Tax ID #02-0222791), or its successor, ________% of the rest of my estate, for any purpose as Alice Peck Day deems appropriate.