You can invest in a basket of real assets (commodities, real estate etc.) that reflect the things you expect to be spending on. There are also real return bond

You can invest in a basket of real assets (commodities, real estate etc.) that reflect the things you expect to be spending on. There are also real return bonds (e.g. TIPS) though those are somewhat vulnerable to manipulation. You can also diversify to other currencies, foreign real estate. Stock indices may be another option.