Amazon has patches with water drops, and flames

However the best designs are iron on patches rather than velco patches

If you are ok with words (ex. Fire, Water, Tools), Amazon also has several options for customizable tactical patches.

Here are some examples of the patches on Amazon:

Water

https://www.amazon.com/dp/B00JSL9KMG/ref=cm_sw_r_cp_apa_i_.ZnsFbQNPWFSR

Fire

https://www.amazon.com/dp/B07T3WMCLQ/ref=cm_sw_r_cp_apa_i_a4nsFb2HHN69M

https://www.amazon.com/dp/B07GMZNXL6/ref=cm_sw_r_cp_apa_i_s4nsFb3BDCBG7

https://www.amazon.com/dp/B07VL72S1G/ref=cm_sw_r_cp_apa_i_V4nsFbGWKAJ0K

Customizable Patch

https://www.amazon.com/dp/B01CIEIN3G/ref=cm_sw_r_cp_apa_i_Y7nsFbCQXQ4R2