<human>: Hey folks,
I am a 'has-been' 5K runner. My most prolific period was 2010 when I was logging like 5K a day for about 5-6 months nonstop. I registered my PB of 25:19(age 33) in that period. Since then, being a Dad to 2 small pre-schoolers, I rarely got any running time.

However, I do walk a LOT in the recent past, brought my weight down to 2004 levels(146 pounds, or 66kg). I have been playing tennis, cricket, ping pong on a regular basis. I travel a lot weekdays so I decided to do spot-running last week, and managed to do it for 1 hour. Then work got crazy.

Moving to 10K has been on my mind all the time. Now that work is settled down a bit, I'm thinking the upcoming race would be good motivation to have a go at it. The lack of practice bothers me, but I believe I can hack my mind to finish the race without much strife.

So, what is the game plan for Saturday? I'd like to do 2 one-hour workouts on Thurs and Fri, then maybe a 20min run Saturday morning? The race is at 10PM so I'm hoping to use Saturday for rest and nutrition. I dont give a damn about the time, just want to SNAIL THROUGH the 1st 5K, then do a slow 5K rest of the race. I did have massive calf cramps after last week's 1 hour workout but I guess that was my stupidity about not stretching properly.

1. What is the best practice I can do for the next 3 days?
2. What should I be eating? How much hydrated should I be(as in X litres of water)?
3. Am I too ambitious and should wimp out and choose the 5K? I'd really like to do the 10K even if it means I plod along like I'd just finished the meal of a giant.

Can you condense the text into three sentences or less?
<bot>: Reasonably agile and active 37 yo has-been 5K runner, wants to do a 10K with very little practice, just has 3 days, doesnt care about time.