If I don’t have the charging cable how do I charge the watch??

Hi, if you have lost the apple watch charger there is no way you can use a normal ipad or iphone charger to charge your watch. You will have to purchase it online, online buy original apple accessories.

here is the link: https://www.apple.com/shop/product/MU9F2AM/A/apple-watch-magnetic-charging-dock

hope it helps.

suppose you can buy a new or a charger stand

Wireless Chargers - Watch Accessories - Apple