Hi i buy a bottle of water and during the day i am drinking it but many times in the day im leaving my office etc Do i need to make a new shehakol on the water each time i reenter my office and drink?

Shalom, Thank you for your question. Here is a copy of a similar question and the answer I wrote to it. I hope this will be of help to you – Question : I want to drink water (from my water bottle) all day long. Before I started to drink, I said the bracha - shehakol. When do I need to say a new bracha, and when can I continue to drink relying on the previous bracha? Answer A blessing before food will last all day long, and cover all the water that is drunk, until one of the following occurs, [after which a new bracha of shehakol will be needed]:- 1. You said an after bracha. 2. You said “let us now recite the after bracha”. 3. You decided for sure to stop drinking. 4. You slept (how long and how deep a sleep is an argument). 5. You changed locations, even if you return to the first location, and even if you had in mind to change locations, unless one of the following applies :- a. You are actually eating constantly (for example, chewing gum) while moving locales. b. You returned to the first location and you left others still eating there. c. You are traveling, did not start eating in a “fixed place” and had in mind to continue eating as you travel. [Note: this only applies if you're traveling on a trip etc., but not if you start eating in the beit midrash and intend to move to your apartment]. d. You changed location inside the building (from room to room). Even so, it is good to have in mind before starting to drink that you will be moving from room to room. e. You can still see the first location (e.g. through a window) and are not separated by a walkway or road. [An enclosed yard is considered as one “room” and therefore one bracha suffices even if you move from one side of the yard to the other. In a large park, as long as one can see the original place of the first bracha, one does not need to recite a new bracha.] So, based on the above rules, your first Shehakol can last you for a long time. As long as you don't go outside, or decide to stop drinking, or go to sleep, etc, it will cover all additional water you drink, even if you refill your water bottle. But, on the other hand, if you walk outside from one building to another – or even back to the first building (if you didn't leave and return to your friends drinking there) – you will need another bracha. All these laws about changing location only apply to foods that require the after bracha of Borie Nefashot, but not to foods that require an after bracha of Mai’ain Shalosh or Birkat HaMazon. For those foods the law is different. For more details and sources see the Shulchan Aruch, Orach Chaim, 178-9. A good reference book is “Brochos” by Rav Y.P. Bodner. Blessings – Rav D. Sperling.