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I am working on a similar issue so have the details to hand;
Sphere WASH appendix 2 - water
Reception/transitcentres 15 litres per person per day if stay is more than one day
3 litres per person per day if stay is limited to day-time
Appendix 3 - toilets
Reception/transit centres 1 toilet to 50 individuals; 3:1 female to male
Additional considerations we have are people not wanting to move out of line for fear or losing their place, and not wanting to go far for fear of being left behind. We have to negotiate with the authorities on this.