Ds has ASD (and possibly ARFID) . Only eats certain foods and lunch every day for years has been sugar free squash, a banana, a pack of mini breadsticks, a babybel and a big petit filous pot. School have changed the rules this year and now say only water or milk. Do I say it’s a reasonable adjustment and keep sending the squash or will it require a drs letter to allow him to continue to have this as it’s the only thing he drinks