# was very thirsty

"needed water to drink"

# But now will I die of thirst and fall into ... uncircumcised?

"But now I will die of thirst and my body will fall into ... uncircumcised." or "But now will you allow me to become so weak from my thirst that I fall into ... uncircumcised?"

# fall into the hands of those who are uncircumcised

"be captured by those godless Philistines"