Topsoil cannot be removed from stream-bottoms. The regulatory obsticles to dredging or filling streams are tremendous. Your friend is mis-informed. What vendors that sell through HD may use are waste forest products and municipal green-waste composts mixed with sludge from surplus activated sludge wastewater systems which has been deactivated by digestion. This material is excessively fine and can cause agglomeration if courser organics are not mixed. If you believe you or your friend can prove the soil came from a stream-bed, report it to EPA and the Corps of Engineers. I bet you are wrong.
The soil mixes sold by Home Depot are different by various brands and mixtures sold throughout the country. HD does not manufacture any of these products, they buy from many different companies (Scotts, Miracle Grow, Hyponex, Generics) and resell those products. Even the brands sold by HD do not actually produce the topsoil, it is mixed and packaged by others and sold under the brand name. You may have gotten unsatisfactory soil. Complain to the store and the company the soil was branded under, so they are aware of the problem. You never know, they might make an adjustment for the defective materials.
2-weeks is a very short period of time in which to have established grass. The germination of bluegrass (seedlings) takes 2 weeks. Scotts specifies daily watering until plants are established in 6 to 8 weeks. Mid and late summer planting is very difficult due to rapid dehydration from high temps and sun angles. if watering is omitted for even a short time, mortality is certain. Under these conditions, the die-off from not watering 2 days is predictable. You should try again in the fall when temperature cool and the sun is not right overhead. Good luck.