Here are the estimated prices for the items included in the disaster survival kit, both mandatory and optional, based on current online listings:

Mandatory Survival Supplies

1. Water (1 gallon per person per day, for at least three days): Around $1.00–$2.50 per gallon ​(  
   Almanac.com ).
2. Non-perishable food (at least a three-day supply): Canned goods and high-energy snacks cost approximately $20–$50​(
   American Survivalist )​(Almanac.com).
3. First aid kit: Basic kits range from $10 to $30, depending on size and contents ​(
   American Survivalist )​( Almanac.com).
4. Battery-powered or hand-crank radio: Prices range from $20 to $50​(
   American Survivalist ).
5. Flashlight and extra batteries: Basic models start around $10–$20​(
   American Survivalist ).
6. Multi-tool or utility knife: Average cost is $25–$50​(
   American Survivalist ).
7. Whistle: Usually priced between $2 and $10​(
   Almanac.com ).
8. Dust masks or N95 masks: Packs of masks typically cost around $10–$30​(
   American Survivalist ).
9. Plastic sheeting and duct tape: Combined, these cost about $10–$25​(
   Almanac.com ).
10. Moist towelettes, garbage bags, plastic ties: Around $10 for a pack​ ( 
    Almanac.com ).
11. Local maps: Printed maps cost approximately $5–$15 ​(
    American Survivalist ).
12. Wrench or pliers: Average cost is $10–$20​(
    Almanac.com

    ).

13. Cell phone with chargers (solar chargers are ideal): Solar chargers cost about $25–$50​(
    American Survivalist

    ).

14. Cash (small denominations): Variable, depending on how much you wish to carry.