Water is life. When they say you can live 3 days without it, keep in mind that into the second day, you’re going to start really suffering. That third day you are technically alive but you won’t be functional enough to help yourself.
DIY Survival Pantry: Advanced Prepper's Guide on How to Stockpile a 6 Month Supply of Food and Water! With Modern Tips and Hacks! (Canning and Preserving, Prepper Survival, Preppers Pantry). This book is free as I type this today, but well worth the low price otherwise. Really good author, readable and well organized. Recommended!